640149814 has 16 divisors (see below), whose sum is σ = 992140416. Its totient is φ = 309456000.

The previous prime is 640149793. The next prime is 640149827. The reversal of 640149814 is 418941046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70164 + ... + 78760.

It is an arithmetic number, because the mean of its divisors is an integer number (62008776).

Almost surely, 2^640149814 is an apocalyptic number.

640149814 is a deficient number, since it is larger than the sum of its proper divisors (351990602).

640149814 is a wasteful number, since it uses less digits than its factorization.

640149814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9831.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 640149814 is about 25301.1820672474. The cubic root of 640149814 is about 861.8411133663.

The spelling of 640149814 in words is "six hundred forty million, one hundred forty-nine thousand, eight hundred fourteen".