640460371 has 2 divisors, whose sum is σ = 640460372. Its totient is φ = 640460370.

The previous prime is 640460357. The next prime is 640460407. The reversal of 640460371 is 173064046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640460371 - 2⁵ = 640460339 is a prime.

It is not a weakly prime, because it can be changed into another prime (640460311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320230185 + 320230186.

It is an arithmetic number, because the mean of its divisors is an integer number (320230186).

Almost surely, 2^640460371 is an apocalyptic number.

640460371 is a deficient number, since it is larger than the sum of its proper divisors (1).

640460371 is an equidigital number, since it uses as much as digits as its factorization.

640460371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 640460371 is about 25307.3185264658. The cubic root of 640460371 is about 861.9804596644.

The spelling of 640460371 in words is "six hundred forty million, four hundred sixty thousand, three hundred seventy-one".