87213055520 has 24 divisors (see below), whose sum is σ = 206040844044. Its totient is φ = 34885222144.

The previous prime is 87213055493. The next prime is 87213055549. The reversal of 87213055520 is 2555031278.

It can be written as a sum of positive squares in 2 ways, for example, as 86193913744 + 1019141776 = 293588^2 + 31924^2 .

It is a super-2 number, since 2×87213055520² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272540639 + ... + 272540958.

Almost surely, 2^87213055520 is an apocalyptic number.

87213055520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87213055520 is an abundant number, since it is smaller than the sum of its proper divisors (118827788524).

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

87213055520 is a wasteful number, since it uses less digits than its factorization.

87213055520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545081612 (or 545081604 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 38.

Adding to 87213055520 its reverse (2555031278), we get a palindrome (89768086798).

The spelling of 87213055520 in words is "eighty-seven billion, two hundred thirteen million, fifty-five thousand, five hundred twenty".