640215514 has 32 divisors (see below), whose sum is σ = 1010568960. Its totient is φ = 303855552.

The previous prime is 640215497. The next prime is 640215559. The reversal of 640215514 is 415512046.

640215514 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 937017 + ... + 937699.

It is an arithmetic number, because the mean of its divisors is an integer number (31580280).

Almost surely, 2^640215514 is an apocalyptic number.

640215514 is a deficient number, since it is larger than the sum of its proper divisors (370353446).

640215514 is a wasteful number, since it uses less digits than its factorization.

640215514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 640215514 is about 25302.4803922461. The cubic root of 640215514 is about 861.8705965815.

The spelling of 640215514 in words is "six hundred forty million, two hundred fifteen thousand, five hundred fourteen".