977707780 has 96 divisors (see below), whose sum is σ = 2407104000. Its totient is φ = 333438336.

The previous prime is 977707777. The next prime is 977707781. The reversal of 977707780 is 87707779.

It is not an unprimeable number, because it can be changed into a prime (977707781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2462542 + ... + 2462938.

It is an arithmetic number, because the mean of its divisors is an integer number (25074000).

Almost surely, 2^977707780 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 977707780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203552000).

977707780 is an abundant number, since it is smaller than the sum of its proper divisors (1429396220).

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

977707780 is a wasteful number, since it uses less digits than its factorization.

977707780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 1210104, while the sum is 52.

The square root of 977707780 is about 31268.3191105630. The cubic root of 977707780 is about 992.5133499464.

The spelling of 977707780 in words is "nine hundred seventy-seven million, seven hundred seven thousand, seven hundred eighty".