87469639 has 4 divisors (see below), whose sum is σ = 88775224. Its totient is φ = 86164056.

The previous prime is 87469637. The next prime is 87469651. The reversal of 87469639 is 93696478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93696478 = 2 ⋅46848239.

It is a cyclic number.

It is not a de Polignac number, because 87469639 - 2¹ = 87469637 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 (87469637) 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, 652692 + ... + 652825.

It is an arithmetic number, because the mean of its divisors is an integer number (22193806).

Almost surely, 2^87469639 is an apocalyptic number.

87469639 is a deficient number, since it is larger than the sum of its proper divisors (1305585).

87469639 is a wasteful number, since it uses less digits than its factorization.

87469639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305584.

The product of its digits is 1959552, while the sum is 52.

The square root of 87469639 is about 9352.5204624208. The cubic root of 87469639 is about 443.9006470200.

It can be divided in two parts, 8 and 7469639, that added together give a palindrome (7469647).

The spelling of 87469639 in words is "eighty-seven million, four hundred sixty-nine thousand, six hundred thirty-nine".