87638233 has 4 divisors (see below), whose sum is σ = 87719220. Its totient is φ = 87557248.

The previous prime is 87638231. The next prime is 87638263. The reversal of 87638233 is 33283678.

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 17614809 + 70023424 = 4197^2 + 8368^2 .

It is a cyclic number.

It is not a de Polignac number, because 87638233 - 2¹ = 87638231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87638231) 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, 38848 + ... + 41041.

It is an arithmetic number, because the mean of its divisors is an integer number (21929805).

Almost surely, 2^87638233 is an apocalyptic number.

It is an amenable number.

87638233 is a deficient number, since it is larger than the sum of its proper divisors (80987).

87638233 is a wasteful number, since it uses less digits than its factorization.

87638233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80986.

The product of its digits is 145152, while the sum is 40.

The square root of 87638233 is about 9361.5294156457. The cubic root of 87638233 is about 444.1856638364.

The spelling of 87638233 in words is "eighty-seven million, six hundred thirty-eight thousand, two hundred thirty-three".