87239807 has 4 divisors (see below), whose sum is σ = 87341760. Its totient is φ = 87137856.

The previous prime is 87239783. The next prime is 87239813. The reversal of 87239807 is 70893278.

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 87239807 - 2¹⁰ = 87238783 is a prime.

It is a super-2 number, since 2×87239807² = 15221567850794498, 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 (87239827) 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, 49682 + ... + 51407.

It is an arithmetic number, because the mean of its divisors is an integer number (21835440).

Almost surely, 2^87239807 is an apocalyptic number.

87239807 is a deficient number, since it is larger than the sum of its proper divisors (101953).

87239807 is a wasteful number, since it uses less digits than its factorization.

87239807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101952.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 87239807 is about 9340.2252114175. The cubic root of 87239807 is about 443.5115136694.

The spelling of 87239807 in words is "eighty-seven million, two hundred thirty-nine thousand, eight hundred seven".