81373004 has 12 divisors (see below), whose sum is σ = 142753800. Its totient is φ = 40586208.

The previous prime is 81373003. The next prime is 81373013. The reversal of 81373004 is 40037318.

It is not an unprimeable number, because it can be changed into a prime (81373003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23234 + ... + 26505.

It is an arithmetic number, because the mean of its divisors is an integer number (11896150).

Almost surely, 2^81373004 is an apocalyptic number.

It is an amenable number.

81373004 is a deficient number, since it is larger than the sum of its proper divisors (61380796).

81373004 is a wasteful number, since it uses less digits than its factorization.

81373004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50152 (or 50150 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 81373004 is about 9020.6986425664. The cubic root of 81373004 is about 433.3380083651.

The spelling of 81373004 in words is "eighty-one million, three hundred seventy-three thousand, four".