87209764 has 12 divisors (see below), whose sum is σ = 152754588. Its totient is φ = 43565600.

The previous prime is 87209761. The next prime is 87209783. The reversal of 87209764 is 46790278.

It can be written as a sum of positive squares in 2 ways, for example, as 40424164 + 46785600 = 6358^2 + 6840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87209764.

It is not an unprimeable number, because it can be changed into a prime (87209761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507 + ... + 13954.

It is an arithmetic number, because the mean of its divisors is an integer number (12729549).

Almost surely, 2^87209764 is an apocalyptic number.

It is an amenable number.

87209764 is a deficient number, since it is larger than the sum of its proper divisors (65544824).

87209764 is a wasteful number, since it uses less digits than its factorization.

87209764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19646 (or 19644 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 87209764 is about 9338.6168140683. The cubic root of 87209764 is about 443.4605967517.

The spelling of 87209764 in words is "eighty-seven million, two hundred nine thousand, seven hundred sixty-four".