61578980 has 24 divisors (see below), whose sum is σ = 129463488. Its totient is φ = 24603488.

The previous prime is 61578961. The next prime is 61578991. The reversal of 61578980 is 8987516.

It is a happy number.

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, 32417 + ... + 34263.

It is an arithmetic number, because the mean of its divisors is an integer number (5394312).

Almost surely, 2^61578980 is an apocalyptic number.

It is an amenable number.

61578980 is an abundant number, since it is smaller than the sum of its proper divisors (67884508).

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

61578980 is a wasteful number, since it uses less digits than its factorization.

61578980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3523 (or 3521 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 61578980 is about 7847.2275358881. The cubic root of 61578980 is about 394.8912374803.

The spelling of 61578980 in words is "sixty-one million, five hundred seventy-eight thousand, nine hundred eighty".