87239728 has 10 divisors (see below), whose sum is σ = 169027004. Its totient is φ = 43619856.

The previous prime is 87239717. The next prime is 87239731. The reversal of 87239728 is 82793278.

It is a super-2 number, since 2×87239728² = 15221540283027968, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2726226 + ... + 2726257.

Almost surely, 2^87239728 is an apocalyptic number.

It is an amenable number.

87239728 is a deficient number, since it is larger than the sum of its proper divisors (81787276).

87239728 is a wasteful number, since it uses less digits than its factorization.

87239728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5452491 (or 5452485 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 87239728 is about 9340.2209823965. The cubic root of 87239728 is about 443.5113797954.

The spelling of 87239728 in words is "eighty-seven million, two hundred thirty-nine thousand, seven hundred twenty-eight".