87264215378 has 18 divisors (see below), whose sum is σ = 132440022981. Its totient is φ = 43123477584.

The previous prime is 87264215321. The next prime is 87264215453. The reversal of 87264215378 is 87351246278.

It can be written as a sum of positive squares in 2 ways, for example, as 78004579849 + 9259635529 = 279293^2 + 96227^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=208883.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 37180001 + ... + 37182347.

Almost surely, 2^87264215378 is an apocalyptic number.

87264215378 is a deficient number, since it is larger than the sum of its proper divisors (45175807603).

87264215378 is an frugal number, since it uses more digits than its factorization.

87264215378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874 (or 2438 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 53.

The spelling of 87264215378 in words is "eighty-seven billion, two hundred sixty-four million, two hundred fifteen thousand, three hundred seventy-eight".