640614402 has 24 divisors (see below), whose sum is σ = 1400285484. Its totient is φ = 211647744.

The previous prime is 640614361. The next prime is 640614409. The reversal of 640614402 is 204416046.

640614402 is a `hidden beast` number, since 6 + 4 + 0 + 614 + 40 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 414081801 + 226532601 = 20349^2 + 15051^2 .

It is not an unprimeable number, because it can be changed into a prime (640614409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155443 + ... + 159510.

Almost surely, 2^640614402 is an apocalyptic number.

640614402 is an abundant number, since it is smaller than the sum of its proper divisors (759671082).

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

640614402 is a wasteful number, since it uses less digits than its factorization.

640614402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315074 (or 315071 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 640614402 is about 25310.3615541146. The cubic root of 640614402 is about 862.0495563516.

The spelling of 640614402 in words is "six hundred forty million, six hundred fourteen thousand, four hundred two".