640460415 has 64 divisors (see below), whose sum is σ = 1230299136. Its totient is φ = 278163072.

The previous prime is 640460407. The next prime is 640460423. The reversal of 640460415 is 514064046.

It is an interprime number because it is at equal distance from previous prime (640460407) and next prime (640460423).

It is not a de Polignac number, because 640460415 - 2³ = 640460407 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 63 ways as a sum of consecutive naturals, for example, 392832 + ... + 394458.

It is an arithmetic number, because the mean of its divisors is an integer number (19223424).

Almost surely, 2^640460415 is an apocalyptic number.

640460415 is a deficient number, since it is larger than the sum of its proper divisors (589838721).

640460415 is a wasteful number, since it uses less digits than its factorization.

640460415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 640460415 is about 25307.3193957796. The cubic root of 640460415 is about 861.9804794039.

The spelling of 640460415 in words is "six hundred forty million, four hundred sixty thousand, four hundred fifteen".