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661028544 = 263211172192
BaseRepresentation
bin100111011001100…
…111111011000000
31201001211201200200
4213121213323000
52323210403134
6145332045200
722244435631
oct4731477300
91631751620
10661028544
1130a151590
12165463800
13a6c45a67
1463b11888
153d075499
hex27667ec0

661028544 has 378 divisors, whose sum is σ = 2317350204. Its totient is φ = 178606080.

The previous prime is 661028497. The next prime is 661028549. The reversal of 661028544 is 445820166.

661028544 is a `hidden beast` number, since 6 + 6 + 102 + 8 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 661028499 and 661028508.

It is not an unprimeable number, because it can be changed into a prime (661028549) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 34790967 + ... + 34790985.

Almost surely, 2661028544 is an apocalyptic number.

661028544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661028544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158675102).

661028544 is an abundant number, since it is smaller than the sum of its proper divisors (1656321660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661028544 is a wasteful number, since it uses less digits than its factorization.

661028544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 661028544 is about 25710.4753748351. The cubic root of 661028544 is about 871.1108125857.

The spelling of 661028544 in words is "six hundred sixty-one million, twenty-eight thousand, five hundred forty-four".