61860315920 has 40 divisors (see below), whose sum is σ = 154888716696. Its totient is φ = 22840731648.

The previous prime is 61860315911. The next prime is 61860315967. The reversal of 61860315920 is 2951306816.

It can be written as a sum of positive squares in 4 ways, for example, as 2929840384 + 58930475536 = 54128^2 + 242756^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 29739497 + ... + 29741576.

Almost surely, 2^61860315920 is an apocalyptic number.

It is an amenable number.

61860315920 is an abundant number, since it is smaller than the sum of its proper divisors (93028400776).

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

61860315920 is a wasteful number, since it uses less digits than its factorization.

61860315920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59481099 (or 59481093 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 61860315920 in words is "sixty-one billion, eight hundred sixty million, three hundred fifteen thousand, nine hundred twenty".