87204813 has 8 divisors (see below), whose sum is σ = 122392800. Its totient is φ = 55076688.

The previous prime is 87204809. The next prime is 87204841. The reversal of 87204813 is 31840278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87204813 - 2² = 87204809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87204113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764898 + ... + 765011.

It is an arithmetic number, because the mean of its divisors is an integer number (15299100).

Almost surely, 2^87204813 is an apocalyptic number.

It is an amenable number.

87204813 is a deficient number, since it is larger than the sum of its proper divisors (35187987).

87204813 is a wasteful number, since it uses less digits than its factorization.

87204813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529931.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 87204813 is about 9338.3517282227. The cubic root of 87204813 is about 443.4522046678.

The spelling of 87204813 in words is "eighty-seven million, two hundred four thousand, eight hundred thirteen".