81860786370 has 96 divisors (see below), whose sum is σ = 232238672640. Its totient is φ = 19840619520.

The previous prime is 81860786347. The next prime is 81860786411. The reversal of 81860786370 is 7368706818.

It is a super-2 number, since 2×81860786370² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7676082 + ... + 7686738.

It is an arithmetic number, because the mean of its divisors is an integer number (2419152840).

Almost surely, 2^81860786370 is an apocalyptic number.

81860786370 is an abundant number, since it is smaller than the sum of its proper divisors (150377886270).

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

81860786370 is a wasteful number, since it uses less digits than its factorization.

81860786370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18440 (or 18437 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 81860786370 in words is "eighty-one billion, eight hundred sixty million, seven hundred eighty-six thousand, three hundred seventy".