87261818712 has 32 divisors (see below), whose sum is σ = 220193380800. Its totient is φ = 28815428384.

The previous prime is 87261818659. The next prime is 87261818731. The reversal of 87261818712 is 21781816278.

It is a super-2 number, since 2×87261818712² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16987662 + ... + 16992797.

It is an arithmetic number, because the mean of its divisors is an integer number (6881043150).

Almost surely, 2^87261818712 is an apocalyptic number.

It is an amenable number.

87261818712 is an abundant number, since it is smaller than the sum of its proper divisors (132931562088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87261818712 is a wasteful number, since it uses less digits than its factorization.

87261818712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33980575 (or 33980571 counting only the distinct ones).

The product of its digits is 602112, while the sum is 51.

The spelling of 87261818712 in words is "eighty-seven billion, two hundred sixty-one million, eight hundred eighteen thousand, seven hundred twelve".