61989256 has 32 divisors (see below), whose sum is σ = 133165440. Its totient is φ = 26500608.

The previous prime is 61989247. The next prime is 61989283. The reversal of 61989256 is 65298916.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26136 + ... + 28408.

It is an arithmetic number, because the mean of its divisors is an integer number (4161420).

Almost surely, 2^61989256 is an apocalyptic number.

61989256 is the 4546-th octagonal number.

It is an amenable number.

61989256 is an abundant number, since it is smaller than the sum of its proper divisors (71176184).

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

61989256 is a wasteful number, since it uses less digits than its factorization.

61989256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773 (or 2769 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 61989256 is about 7873.3255997704. The cubic root of 61989256 is about 395.7662975035.

The spelling of 61989256 in words is "sixty-one million, nine hundred eighty-nine thousand, two hundred fifty-six".