89177979978 has 48 divisors (see below), whose sum is σ = 196668329832. Its totient is φ = 29196720000.

The previous prime is 89177979941. The next prime is 89177980051. The reversal of 89177979978 is 87997977198.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 39264611409 + 49913368569 = 198153^2 + 223413^2 .

It is a super-2 number, since 2×89177979978² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 89177979897 and 89177979906.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 711768 + ... + 827628.

Almost surely, 2^89177979978 is an apocalyptic number.

89177979978 is an abundant number, since it is smaller than the sum of its proper divisors (107490349854).

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

89177979978 is a wasteful number, since it uses less digits than its factorization.

89177979978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116631 (or 116628 counting only the distinct ones).

The product of its digits is 1008189504, while the sum is 81.

The spelling of 89177979978 in words is "eighty-nine billion, one hundred seventy-seven million, nine hundred seventy-nine thousand, nine hundred seventy-eight".