977808502788 has 96 divisors (see below), whose sum is σ = 2471776935936. Its totient is φ = 299065951872.

The previous prime is 977808502787. The next prime is 977808502819. The reversal of 977808502788 is 887205808779.

It is a super-2 number, since 2×977808502788² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (977808502787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22748445 + ... + 22791387.

It is an arithmetic number, because the mean of its divisors is an integer number (25747676416).

Almost surely, 2^977808502788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 977808502788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235888467968).

977808502788 is an abundant number, since it is smaller than the sum of its proper divisors (1493968433148).

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

977808502788 is a wasteful number, since it uses less digits than its factorization.

977808502788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43833 (or 43831 counting only the distinct ones).

The product of its (nonzero) digits is 126443520, while the sum is 69.

The spelling of 977808502788 in words is "nine hundred seventy-seven billion, eight hundred eight million, five hundred two thousand, seven hundred eighty-eight".