87261812 has 36 divisors (see below), whose sum is σ = 173668740. Its totient is φ = 38290560.

The previous prime is 87261787. The next prime is 87261821. The reversal of 87261812 is 21816278.

It can be written as a sum of positive squares in 2 ways, for example, as 55294096 + 31967716 = 7436^2 + 5654^2 .

It is a super-2 number, since 2×87261812² = 15229247667046688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10928 + ... + 17144.

Almost surely, 2^87261812 is an apocalyptic number.

It is an amenable number.

87261812 is a deficient number, since it is larger than the sum of its proper divisors (86406928).

87261812 is a wasteful number, since it uses less digits than its factorization.

87261812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6272 (or 6259 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 87261812 is about 9341.4031066002. The cubic root of 87261812 is about 443.5488003575.

The spelling of 87261812 in words is "eighty-seven million, two hundred sixty-one thousand, eight hundred twelve".