89815897 has 16 divisors (see below), whose sum is σ = 97763328. Its totient is φ = 82265040.

The previous prime is 89815841. The next prime is 89815931. The reversal of 89815897 is 79851898.

It is a cyclic number.

It is not a de Polignac number, because 89815897 - 2¹⁵ = 89783129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89815807) 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, 72828 + ... + 74050.

It is an arithmetic number, because the mean of its divisors is an integer number (6110208).

Almost surely, 2^89815897 is an apocalyptic number.

It is an amenable number.

89815897 is a deficient number, since it is larger than the sum of its proper divisors (7947431).

89815897 is a wasteful number, since it uses less digits than its factorization.

89815897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its digits is 1451520, while the sum is 55.

The square root of 89815897 is about 9477.1249332274. The cubic root of 89815897 is about 447.8346956696.

It can be divided in two parts, 8981 and 5897, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 89815897 in words is "eighty-nine million, eight hundred fifteen thousand, eight hundred ninety-seven".