61578656 has 24 divisors (see below), whose sum is σ = 124511940. Its totient is φ = 29956608.

The previous prime is 61578637. The next prime is 61578661. The reversal of 61578656 is 65687516.

It can be written as a sum of positive squares in 2 ways, for example, as 42042256 + 19536400 = 6484^2 + 4420^2 .

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, 24821 + ... + 27188.

Almost surely, 2^61578656 is an apocalyptic number.

It is an amenable number.

61578656 is an abundant number, since it is smaller than the sum of its proper divisors (62933284).

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

61578656 is a wasteful number, since it uses less digits than its factorization.

61578656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52056 (or 52048 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The square root of 61578656 is about 7847.2068916271. The cubic root of 61578656 is about 394.8905449010.

The spelling of 61578656 in words is "sixty-one million, five hundred seventy-eight thousand, six hundred fifty-six".