87874439657 has 4 divisors (see below), whose sum is σ = 88744483716. Its totient is φ = 87004395600.

The previous prime is 87874439647. The next prime is 87874439669. The reversal of 87874439657 is 75693447878.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83253023296 + 4621416361 = 288536^2 + 67981^2 .

It is a cyclic number.

It is not a de Polignac number, because 87874439657 - 2²⁸ = 87606004201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87874439647) 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, 435021878 + ... + 435022079.

It is an arithmetic number, because the mean of its divisors is an integer number (22186120929).

Almost surely, 2^87874439657 is an apocalyptic number.

It is an amenable number.

87874439657 is a deficient number, since it is larger than the sum of its proper divisors (870044059).

87874439657 is a wasteful number, since it uses less digits than its factorization.

87874439657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870044058.

The product of its digits is 284497920, while the sum is 68.

It can be divided in two parts, 8787 and 4439657, that added together give a palindrome (4448444).

The spelling of 87874439657 in words is "eighty-seven billion, eight hundred seventy-four million, four hundred thirty-nine thousand, six hundred fifty-seven".