87639271 has 4 divisors (see below), whose sum is σ = 88329472. Its totient is φ = 86949072.

The previous prime is 87639259. The next prime is 87639281. The reversal of 87639271 is 17293678.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87639271 - 2⁵ = 87639239 is a prime.

It is a super-2 number, since 2×87639271² = 15361283642822882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87639221) 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, 344910 + ... + 345163.

It is an arithmetic number, because the mean of its divisors is an integer number (22082368).

Almost surely, 2^87639271 is an apocalyptic number.

87639271 is a deficient number, since it is larger than the sum of its proper divisors (690201).

87639271 is a wasteful number, since it uses less digits than its factorization.

87639271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690200.

The product of its digits is 127008, while the sum is 43.

The square root of 87639271 is about 9361.5848551407. The cubic root of 87639271 is about 444.1874174960.

The spelling of 87639271 in words is "eighty-seven million, six hundred thirty-nine thousand, two hundred seventy-one".