61550928 has 80 divisors (see below), whose sum is σ = 178956800. Its totient is φ = 20505312.

The previous prime is 61550917. The next prime is 61550933. The reversal of 61550928 is 82905516.

It is a happy number.

It is a super-2 number, since 2×61550928² = 7577033475322368, which contains 22 as substring.

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 = 61550892 and 61550901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34113 + ... + 35871.

It is an arithmetic number, because the mean of its divisors is an integer number (2236960).

Almost surely, 2^61550928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61550928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89478400).

61550928 is an abundant number, since it is smaller than the sum of its proper divisors (117405872).

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

61550928 is an equidigital number, since it uses as much as digits as its factorization.

61550928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 61550928 is about 7845.4399494228. The cubic root of 61550928 is about 394.8312647887.

The spelling of 61550928 in words is "sixty-one million, five hundred fifty thousand, nine hundred twenty-eight".