640027157 has 16 divisors (see below), whose sum is σ = 809201664. Its totient is φ = 491694000.

The previous prime is 640027151. The next prime is 640027163. The reversal of 640027157 is 751720046.

It is an interprime number because it is at equal distance from previous prime (640027151) and next prime (640027163).

It is not a de Polignac number, because 640027157 - 2⁸ = 640026901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640027151) 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, 53069 + ... + 64002.

It is an arithmetic number, because the mean of its divisors is an integer number (50575104).

Almost surely, 2^640027157 is an apocalyptic number.

It is an amenable number.

640027157 is a deficient number, since it is larger than the sum of its proper divisors (169174507).

640027157 is a wasteful number, since it uses less digits than its factorization.

640027157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117160.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 640027157 is about 25298.7580129934. The cubic root of 640027157 is about 861.7860650035.

The spelling of 640027157 in words is "six hundred forty million, twenty-seven thousand, one hundred fifty-seven".