640614428 has 6 divisors (see below), whose sum is σ = 1121075256. Its totient is φ = 320307212.

The previous prime is 640614413. The next prime is 640614439. The reversal of 640614428 is 824416046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80076800 + ... + 80076807.

It is an arithmetic number, because the mean of its divisors is an integer number (186845876).

Almost surely, 2^640614428 is an apocalyptic number.

It is an amenable number.

640614428 is a deficient number, since it is larger than the sum of its proper divisors (480460828).

640614428 is a wasteful number, since it uses less digits than its factorization.

640614428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160153611 (or 160153609 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 640614428 is about 25310.3620677382. The cubic root of 640614428 is about 862.0495680140.

The spelling of 640614428 in words is "six hundred forty million, six hundred fourteen thousand, four hundred twenty-eight".