864042637 has 4 divisors (see below), whose sum is σ = 864169020. Its totient is φ = 863916256.

The previous prime is 864042607. The next prime is 864042649. The reversal of 864042637 is 736240468.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259177801 + 604864836 = 16099^2 + 24594^2 .

It is a cyclic number.

It is not a de Polignac number, because 864042637 - 2²³ = 855654029 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 864042637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864042607) 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, 52312 + ... + 66817.

It is an arithmetic number, because the mean of its divisors is an integer number (216042255).

Almost surely, 2^864042637 is an apocalyptic number.

It is an amenable number.

864042637 is a deficient number, since it is larger than the sum of its proper divisors (126383).

864042637 is a wasteful number, since it uses less digits than its factorization.

864042637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126382.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 864042637 is about 29394.6021745490. The cubic root of 864042637 is about 952.4562980572.

The spelling of 864042637 in words is "eight hundred sixty-four million, forty-two thousand, six hundred thirty-seven".