977721612 has 96 divisors (see below), whose sum is σ = 2788369920. Its totient is φ = 260275200.

The previous prime is 977721611. The next prime is 977721649. The reversal of 977721612 is 216127779.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (977721611) 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, 140839 + ... + 147617.

It is an arithmetic number, because the mean of its divisors is an integer number (29045520).

Almost surely, 2^977721612 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 977721612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1394184960).

977721612 is an abundant number, since it is smaller than the sum of its proper divisors (1810648308).

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

977721612 is a wasteful number, since it uses less digits than its factorization.

977721612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6911 (or 6909 counting only the distinct ones).

The product of its digits is 74088, while the sum is 42.

The square root of 977721612 is about 31268.5402921211. The cubic root of 977721612 is about 992.5180304110.

The spelling of 977721612 in words is "nine hundred seventy-seven million, seven hundred twenty-one thousand, six hundred twelve".