87638137 has 4 divisors (see below), whose sum is σ = 87914916. Its totient is φ = 87361360.

The previous prime is 87638129. The next prime is 87638143. The reversal of 87638137 is 73183678.

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 36529936 + 51108201 = 6044^2 + 7149^2 .

It is a cyclic number.

It is not a de Polignac number, because 87638137 - 2³ = 87638129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87638093 and 87638102.

It is not an unprimeable number, because it can be changed into a prime (87638107) 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, 137914 + ... + 138547.

It is an arithmetic number, because the mean of its divisors is an integer number (21978729).

Almost surely, 2^87638137 is an apocalyptic number.

It is an amenable number.

87638137 is a deficient number, since it is larger than the sum of its proper divisors (276779).

87638137 is a wasteful number, since it uses less digits than its factorization.

87638137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276778.

The product of its digits is 169344, while the sum is 43.

The square root of 87638137 is about 9361.5242882770. The cubic root of 87638137 is about 444.1855016475.

It can be divided in two parts, 8763 and 8137, that added together give a square (16900 = 130²).

The spelling of 87638137 in words is "eighty-seven million, six hundred thirty-eight thousand, one hundred thirty-seven".