8977861520 has 20 divisors (see below), whose sum is σ = 20873528220. Its totient is φ = 3591144576.

The previous prime is 8977861507. The next prime is 8977861523. The reversal of 8977861520 is 251687798.

It can be written as a sum of positive squares in 2 ways, for example, as 5209374976 + 3768486544 = 72176^2 + 61388^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (8977861523) 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, 56111555 + ... + 56111714.

It is an arithmetic number, because the mean of its divisors is an integer number (1043676411).

Almost surely, 2^8977861520 is an apocalyptic number.

8977861520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8977861520 is an abundant number, since it is smaller than the sum of its proper divisors (11895666700).

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

8977861520 is a wasteful number, since it uses less digits than its factorization.

8977861520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112223282 (or 112223276 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

The square root of 8977861520 is about 94751.5779288134. The cubic root of 8977861520 is about 2078.3768710475.

The spelling of 8977861520 in words is "eight billion, nine hundred seventy-seven million, eight hundred sixty-one thousand, five hundred twenty".