87156402589 has 4 divisors (see below), whose sum is σ = 87159217824. Its totient is φ = 87153587356.

The previous prime is 87156402563. The next prime is 87156402667. The reversal of 87156402589 is 98520465178.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87156402589 - 2²¹ = 87154305437 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 (87156402559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1360657 + ... + 1423270.

It is an arithmetic number, because the mean of its divisors is an integer number (21789804456).

Almost surely, 2^87156402589 is an apocalyptic number.

It is an amenable number.

87156402589 is a deficient number, since it is larger than the sum of its proper divisors (2815235).

87156402589 is a wasteful number, since it uses less digits than its factorization.

87156402589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815234.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 87156402589 in words is "eighty-seven billion, one hundred fifty-six million, four hundred two thousand, five hundred eighty-nine".