640537295 has 4 divisors (see below), whose sum is σ = 768644760. Its totient is φ = 512429832.

The previous prime is 640537279. The next prime is 640537343. The reversal of 640537295 is 592735046.

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

It is a cyclic number.

It is not a de Polignac number, because 640537295 - 2⁴ = 640537279 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64053725 + ... + 64053734.

It is an arithmetic number, because the mean of its divisors is an integer number (192161190).

Almost surely, 2^640537295 is an apocalyptic number.

640537295 is a deficient number, since it is larger than the sum of its proper divisors (128107465).

640537295 is a wasteful number, since it uses less digits than its factorization.

640537295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128107464.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 640537295 is about 25308.8382783564. The cubic root of 640537295 is about 862.0149683467.

The spelling of 640537295 in words is "six hundred forty million, five hundred thirty-seven thousand, two hundred ninety-five".