8787387921 has 32 divisors (see below), whose sum is σ = 12848919552. Its totient is φ = 5309245440.

The previous prime is 8787387913. The next prime is 8787387923. The reversal of 8787387921 is 1297837878.

It is not a de Polignac number, because 8787387921 - 2³ = 8787387913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8787387923) 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, 627961 + ... + 641801.

It is an arithmetic number, because the mean of its divisors is an integer number (401528736).

Almost surely, 2^8787387921 is an apocalyptic number.

It is an amenable number.

8787387921 is a deficient number, since it is larger than the sum of its proper divisors (4061531631).

8787387921 is a wasteful number, since it uses less digits than its factorization.

8787387921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14153.

The product of its digits is 9483264, while the sum is 60.

The square root of 8787387921 is about 93741.0684865497. The cubic root of 8787387921 is about 2063.5734564439.

The spelling of 8787387921 in words is "eight billion, seven hundred eighty-seven million, three hundred eighty-seven thousand, nine hundred twenty-one".