85640402587 has 8 divisors (see below), whose sum is σ = 87744852720. Its totient is φ = 83536698240.

The previous prime is 85640402581. The next prime is 85640402629. The reversal of 85640402587 is 78520404658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85640402587 - 2³¹ = 83492918939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85640402587.

It is not an unprimeable number, because it can be changed into a prime (85640402581) 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 7 ways as a sum of consecutive naturals, for example, 49668 + ... + 416830.

It is an arithmetic number, because the mean of its divisors is an integer number (10968106590).

Almost surely, 2^85640402587 is an apocalyptic number.

85640402587 is a deficient number, since it is larger than the sum of its proper divisors (2104450133).

85640402587 is a wasteful number, since it uses less digits than its factorization.

85640402587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372893.

The product of its (nonzero) digits is 2150400, while the sum is 49.

The spelling of 85640402587 in words is "eighty-five billion, six hundred forty million, four hundred two thousand, five hundred eighty-seven".