977220640 has 96 divisors (see below), whose sum is σ = 2530434816. Its totient is φ = 353679360.

The previous prime is 977220613. The next prime is 977220659. The reversal of 977220640 is 46022779.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 977220640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408889 + ... + 411271.

It is an arithmetic number, because the mean of its divisors is an integer number (26358696).

Almost surely, 2^977220640 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 977220640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1265217408).

977220640 is an abundant number, since it is smaller than the sum of its proper divisors (1553214176).

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

977220640 is a wasteful number, since it uses less digits than its factorization.

977220640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642 (or 2634 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 977220640 is about 31260.5284664223. The cubic root of 977220640 is about 992.3484836182.

The spelling of 977220640 in words is "nine hundred seventy-seven million, two hundred twenty thousand, six hundred forty".