640685462 has 8 divisors (see below), whose sum is σ = 961208856. Its totient is φ = 320282512.

The previous prime is 640685413. The next prime is 640685473. The reversal of 640685462 is 264586046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×640685462² = 820955722436306888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15368 + ... + 38955.

It is an arithmetic number, because the mean of its divisors is an integer number (120151107).

Almost surely, 2^640685462 is an apocalyptic number.

640685462 is a deficient number, since it is larger than the sum of its proper divisors (320523394).

640685462 is a wasteful number, since it uses less digits than its factorization.

640685462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60222.

The product of its (nonzero) digits is 276480, while the sum is 41.

The square root of 640685462 is about 25311.7652881027. The cubic root of 640685462 is about 862.0814293870.

The spelling of 640685462 in words is "six hundred forty million, six hundred eighty-five thousand, four hundred sixty-two".