977221216 has 24 divisors (see below), whose sum is σ = 1950263784. Its totient is φ = 481916160.

The previous prime is 977221213. The next prime is 977221237. The reversal of 977221216 is 612122779.

It is a super-2 number, since 2×977221216² = 1909922610001037312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977221213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206830 + ... + 211501.

It is an arithmetic number, because the mean of its divisors is an integer number (81260991).

Almost surely, 2^977221216 is an apocalyptic number.

It is an amenable number.

977221216 is a deficient number, since it is larger than the sum of its proper divisors (973042568).

977221216 is a wasteful number, since it uses less digits than its factorization.

977221216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418414 (or 418406 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 977221216 is about 31260.5376793170. The cubic root of 977221216 is about 992.3486785904.

The spelling of 977221216 in words is "nine hundred seventy-seven million, two hundred twenty-one thousand, two hundred sixteen".