87921897 has 16 divisors (see below), whose sum is σ = 134264832. Its totient is φ = 50132880.

The previous prime is 87921871. The next prime is 87921901. The reversal of 87921897 is 79812978.

It is not a de Polignac number, because 87921897 - 2⁸ = 87921641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87921397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6048 + ... + 14574.

It is an arithmetic number, because the mean of its divisors is an integer number (8391552).

Almost surely, 2^87921897 is an apocalyptic number.

It is an amenable number.

87921897 is a deficient number, since it is larger than the sum of its proper divisors (46342935).

87921897 is a wasteful number, since it uses less digits than its factorization.

87921897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9028.

The product of its digits is 508032, while the sum is 51.

The square root of 87921897 is about 9376.6676916696. The cubic root of 87921897 is about 444.6643886211.

The spelling of 87921897 in words is "eighty-seven million, nine hundred twenty-one thousand, eight hundred ninety-seven".