81265004 has 12 divisors (see below), whose sum is σ = 143622528. Its totient is φ = 40230000.

The previous prime is 81264983. The next prime is 81265013. The reversal of 81265004 is 40056218.

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, 100172 + ... + 100979.

It is an arithmetic number, because the mean of its divisors is an integer number (11968544).

Almost surely, 2^81265004 is an apocalyptic number.

It is an amenable number.

81265004 is a deficient number, since it is larger than the sum of its proper divisors (62357524).

81265004 is a wasteful number, since it uses less digits than its factorization.

81265004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201256 (or 201254 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81265004 is about 9014.7104224151. The cubic root of 81265004 is about 433.1462116481.

The spelling of 81265004 in words is "eighty-one million, two hundred sixty-five thousand, four".