81461400304 has 20 divisors (see below), whose sum is σ = 158086460440. Its totient is φ = 40664894400.

The previous prime is 81461400271. The next prime is 81461400313. The reversal of 81461400304 is 40300416418.

It is a congruent number.

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, 4102647 + ... + 4122454.

It is an arithmetic number, because the mean of its divisors is an integer number (7904323022).

Almost surely, 2^81461400304 is an apocalyptic number.

It is an amenable number.

81461400304 is a deficient number, since it is larger than the sum of its proper divisors (76625060136).

81461400304 is a wasteful number, since it uses less digits than its factorization.

81461400304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8225728 (or 8225722 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 81461400304 in words is "eighty-one billion, four hundred sixty-one million, four hundred thousand, three hundred four".