85721904 has 30 divisors (see below), whose sum is σ = 239902676. Its totient is φ = 28573920.

The previous prime is 85721903. The next prime is 85721963. The reversal of 85721904 is 40912758.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (85721903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 297502 + ... + 297789.

Almost surely, 2^85721904 is an apocalyptic number.

It is an amenable number.

85721904 is an abundant number, since it is smaller than the sum of its proper divisors (154180772).

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

85721904 is a wasteful number, since it uses less digits than its factorization.

85721904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595305 (or 595296 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 85721904 is about 9258.6124230362. The cubic root of 85721904 is about 440.9242006487.

The spelling of 85721904 in words is "eighty-five million, seven hundred twenty-one thousand, nine hundred four".