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BaseRepresentation
bin10100001100000011000
31020121110001
42201200120
5132132103
622102344
75423440
oct2414030
91217401
10661528
1141201a
1227a9b4
131a214a
14133120
15d101d
hexa1818

661528 has 16 divisors (see below), whose sum is σ = 1417680. Its totient is φ = 283488.

The previous prime is 661517. The next prime is 661541. The reversal of 661528 is 825166.

661528 is nontrivially palindromic in base 15.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 661496 and 661505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5851 + ... + 5962.

It is an arithmetic number, because the mean of its divisors is an integer number (88605).

2661528 is an apocalyptic number.

It is an amenable number.

661528 is an abundant number, since it is smaller than the sum of its proper divisors (756152).

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

661528 is a wasteful number, since it uses less digits than its factorization.

661528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11826 (or 11822 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 661528 is about 813.3437157807. The cubic root of 661528 is about 87.1330153588.

The spelling of 661528 in words is "six hundred sixty-one thousand, five hundred twenty-eight".