87904765 has 16 divisors (see below), whose sum is σ = 113965488. Its totient is φ = 64705536.

The previous prime is 87904741. The next prime is 87904769. The reversal of 87904765 is 56740978.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3467044 + 84437721 = 1862^2 + 9189^2 .

It is a cyclic number.

It is not a de Polignac number, because 87904765 - 2⁹ = 87904253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87904769) 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 15 ways as a sum of consecutive naturals, for example, 19899 + ... + 23911.

It is an arithmetic number, because the mean of its divisors is an integer number (7122843).

Almost surely, 2^87904765 is an apocalyptic number.

It is an amenable number.

87904765 is a deficient number, since it is larger than the sum of its proper divisors (26060723).

87904765 is a wasteful number, since it uses less digits than its factorization.

87904765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4368.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 87904765 is about 9375.7541030042. The cubic root of 87904765 is about 444.6355050876.

The spelling of 87904765 in words is "eighty-seven million, nine hundred four thousand, seven hundred sixty-five".