81303576408 has 48 divisors (see below), whose sum is σ = 220314865680. Its totient is φ = 27086708544.

The previous prime is 81303576401. The next prime is 81303576499. The reversal of 81303576408 is 80467530318.

81303576408 is a `hidden beast` number, since 8 + 1 + 30 + 3 + 576 + 40 + 8 = 666.

It is a super-2 number, since 2×81303576408² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81303576401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165660 + ... + 435947.

It is an arithmetic number, because the mean of its divisors is an integer number (4589893035).

Almost surely, 2^81303576408 is an apocalyptic number.

It is an amenable number.

81303576408 is an abundant number, since it is smaller than the sum of its proper divisors (139011289272).

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

81303576408 is a wasteful number, since it uses less digits than its factorization.

81303576408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603496 (or 603489 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 81303576408 in words is "eighty-one billion, three hundred three million, five hundred seventy-six thousand, four hundred eight".