640524051 has 16 divisors (see below), whose sum is σ = 949497120. Its totient is φ = 426758400.

The previous prime is 640524007. The next prime is 640524061. The reversal of 640524051 is 150425046.

It is not a de Polignac number, because 640524051 - 2¹⁰ = 640523027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (640524061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45451 + ... + 57851.

It is an arithmetic number, because the mean of its divisors is an integer number (59343570).

Almost surely, 2^640524051 is an apocalyptic number.

640524051 is a deficient number, since it is larger than the sum of its proper divisors (308973069).

640524051 is a wasteful number, since it uses less digits than its factorization.

640524051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14323 (or 14317 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 640524051 is about 25308.5766292773. The cubic root of 640524051 is about 862.0090271860.

Adding to 640524051 its reverse (150425046), we get a palindrome (790949097).

The spelling of 640524051 in words is "six hundred forty million, five hundred twenty-four thousand, fifty-one".