640365474 has 32 divisors (see below), whose sum is σ = 1540730880. Its totient is φ = 173331792.

The previous prime is 640365461. The next prime is 640365497. The reversal of 640365474 is 474563046.

It is a happy number.

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, 400434 + ... + 402029.

It is an arithmetic number, because the mean of its divisors is an integer number (48147840).

Almost surely, 2^640365474 is an apocalyptic number.

640365474 is an abundant number, since it is smaller than the sum of its proper divisors (900365406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640365474 is a wasteful number, since it uses less digits than its factorization.

640365474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802494.

The product of its (nonzero) digits is 241920, while the sum is 39.

The square root of 640365474 is about 25305.4435645772. The cubic root of 640365474 is about 861.9378843525.

The spelling of 640365474 in words is "six hundred forty million, three hundred sixty-five thousand, four hundred seventy-four".