81413004 has 24 divisors (see below), whose sum is σ = 191242800. Its totient is φ = 26954944.

The previous prime is 81412993. The next prime is 81413011. The reversal of 81413004 is 40031418.

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, 20979 + ... + 24554.

It is an arithmetic number, because the mean of its divisors is an integer number (7968450).

Almost surely, 2^81413004 is an apocalyptic number.

It is an amenable number.

81413004 is an abundant number, since it is smaller than the sum of its proper divisors (109829796).

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

81413004 is a wasteful number, since it uses less digits than its factorization.

81413004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45689 (or 45687 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81413004 is about 9022.9154933425. The cubic root of 81413004 is about 433.4090011190.

The spelling of 81413004 in words is "eighty-one million, four hundred thirteen thousand, four".