87388897 has 4 divisors (see below), whose sum is σ = 88190740. Its totient is φ = 86587056.

The previous prime is 87388877. The next prime is 87388909. The reversal of 87388897 is 79888378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79888378 = 2 ⋅39944189.

It can be written as a sum of positive squares in 2 ways, for example, as 39488656 + 47900241 = 6284^2 + 6921^2 .

It is a cyclic number.

It is not a de Polignac number, because 87388897 - 2²³ = 79000289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87388817) 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, 400758 + ... + 400975.

It is an arithmetic number, because the mean of its divisors is an integer number (22047685).

Almost surely, 2^87388897 is an apocalyptic number.

It is an amenable number.

87388897 is a deficient number, since it is larger than the sum of its proper divisors (801843).

87388897 is a wasteful number, since it uses less digits than its factorization.

87388897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801842.

The product of its digits is 5419008, while the sum is 58.

The square root of 87388897 is about 9348.2028754194. The cubic root of 87388897 is about 443.7640188126.

The spelling of 87388897 in words is "eighty-seven million, three hundred eighty-eight thousand, eight hundred ninety-seven".