640000536 has 64 divisors (see below), whose sum is σ = 1891641600. Its totient is φ = 176550528.

The previous prime is 640000531. The next prime is 640000583. The reversal of 640000536 is 635000046.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640000531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60810 + ... + 70553.

It is an arithmetic number, because the mean of its divisors is an integer number (29556900).

Almost surely, 2^640000536 is an apocalyptic number.

It is an amenable number.

640000536 is an abundant number, since it is smaller than the sum of its proper divisors (1251641064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640000536 is a wasteful number, since it uses less digits than its factorization.

640000536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131408 (or 131404 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 640000536 is about 25298.2318749750. The cubic root of 640000536 is about 861.7741165912.

The spelling of 640000536 in words is "six hundred forty million, five hundred thirty-six", and thus it is an aban number.