87287639 has 4 divisors (see below), whose sum is σ = 92422224. Its totient is φ = 82153056.

The previous prime is 87287623. The next prime is 87287657. The reversal of 87287639 is 93678278.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93678278 = 2 ⋅46839139.

It is a cyclic number.

It is not a de Polignac number, because 87287639 - 2⁴ = 87287623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87287689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2567267 + ... + 2567300.

It is an arithmetic number, because the mean of its divisors is an integer number (23105556).

Almost surely, 2^87287639 is an apocalyptic number.

87287639 is a deficient number, since it is larger than the sum of its proper divisors (5134585).

87287639 is a wasteful number, since it uses less digits than its factorization.

87287639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134584.

The product of its digits is 1016064, while the sum is 50.

The square root of 87287639 is about 9342.7853983702. The cubic root of 87287639 is about 443.5925552930.

The spelling of 87287639 in words is "eighty-seven million, two hundred eighty-seven thousand, six hundred thirty-nine".