87264639 has 36 divisors (see below), whose sum is σ = 159967080. Its totient is φ = 45329760.

The previous prime is 87264629. The next prime is 87264641. The reversal of 87264639 is 93646278.

87264639 is a `hidden beast` number, since 8 + 7 + 2 + 6 + 4 + 639 = 666.

It is not a de Polignac number, because 87264639 - 2¹⁵ = 87231871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87264594 and 87264603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87264629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4144 + ... + 13845.

It is an arithmetic number, because the mean of its divisors is an integer number (4443530).

Almost surely, 2^87264639 is an apocalyptic number.

87264639 is a deficient number, since it is larger than the sum of its proper divisors (72702441).

87264639 is a wasteful number, since it uses less digits than its factorization.

87264639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18020 (or 18010 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 87264639 is about 9341.5544209730. The cubic root of 87264639 is about 443.5535901538.

The spelling of 87264639 in words is "eighty-seven million, two hundred sixty-four thousand, six hundred thirty-nine".