87631769 has 4 divisors (see below), whose sum is σ = 87675060. Its totient is φ = 87588480.

The previous prime is 87631763. The next prime is 87631811. The reversal of 87631769 is 96713678.

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 42406144 + 45225625 = 6512^2 + 6725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87631769 is a prime.

It is a super-2 number, since 2×87631769² = 15358653876138722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87631763) 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, 18452 + ... + 22709.

It is an arithmetic number, because the mean of its divisors is an integer number (21918765).

Almost surely, 2^87631769 is an apocalyptic number.

It is an amenable number.

87631769 is a deficient number, since it is larger than the sum of its proper divisors (43291).

87631769 is a wasteful number, since it uses less digits than its factorization.

87631769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43290.

The product of its digits is 381024, while the sum is 47.

The square root of 87631769 is about 9361.1841665465. The cubic root of 87631769 is about 444.1747428543.

The spelling of 87631769 in words is "eighty-seven million, six hundred thirty-one thousand, seven hundred sixty-nine".