87172004 has 12 divisors (see below), whose sum is σ = 153665484. Its totient is φ = 43267584.

The previous prime is 87171979. The next prime is 87172009. The reversal of 87172004 is 40027178.

It can be written as a sum of positive squares in 2 ways, for example, as 65642404 + 21529600 = 8102^2 + 4640^2 .

It is not an unprimeable number, because it can be changed into a prime (87172009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78989 + ... + 80084.

It is an arithmetic number, because the mean of its divisors is an integer number (12805457).

Almost surely, 2^87172004 is an apocalyptic number.

It is an amenable number.

87172004 is a deficient number, since it is larger than the sum of its proper divisors (66493480).

87172004 is a wasteful number, since it uses less digits than its factorization.

87172004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159214 (or 159212 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 87172004 is about 9336.5948825040. The cubic root of 87172004 is about 443.3965844642.

The spelling of 87172004 in words is "eighty-seven million, one hundred seventy-two thousand, four".