87777797960 has 32 divisors (see below), whose sum is σ = 209117696760. Its totient is φ = 33045758976.

The previous prime is 87777797917. The next prime is 87777797969. The reversal of 87777797960 is 6979777778.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61334484964 + 26443312996 = 247658^2 + 162614^2 .

It is not an unprimeable number, because it can be changed into a prime (87777797969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64541819 + ... + 64543178.

Almost surely, 2^87777797960 is an apocalyptic number.

It is an amenable number.

87777797960 is an abundant number, since it is smaller than the sum of its proper divisors (121339898800).

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

87777797960 is a wasteful number, since it uses less digits than its factorization.

87777797960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129085025 (or 129085021 counting only the distinct ones).

The product of its (nonzero) digits is 457419312, while the sum is 74.

The spelling of 87777797960 in words is "eighty-seven billion, seven hundred seventy-seven million, seven hundred ninety-seven thousand, nine hundred sixty".