640246354 has 32 divisors (see below), whose sum is σ = 1108266624. Its totient is φ = 274538880.

The previous prime is 640246319. The next prime is 640246391. The reversal of 640246354 is 453642046.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28272 + ... + 45604.

It is an arithmetic number, because the mean of its divisors is an integer number (34633332).

Almost surely, 2^640246354 is an apocalyptic number.

640246354 is a deficient number, since it is larger than the sum of its proper divisors (468020270).

640246354 is a wasteful number, since it uses less digits than its factorization.

640246354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17442.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 640246354 is about 25303.0898113254. The cubic root of 640246354 is about 861.8844354956.

The spelling of 640246354 in words is "six hundred forty million, two hundred forty-six thousand, three hundred fifty-four".