640614429 has 24 divisors (see below), whose sum is σ = 1138871552. Its totient is φ = 337906080.

The previous prime is 640614413. The next prime is 640614439. The reversal of 640614429 is 924416046.

640614429 is a `hidden beast` number, since 640 + 6 + 1 + 4 + 4 + 2 + 9 = 666.

It is not a de Polignac number, because 640614429 - 2⁴ = 640614413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640614393 and 640614402.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 390277 + ... + 391914.

Almost surely, 2^640614429 is an apocalyptic number.

It is an amenable number.

640614429 is a deficient number, since it is larger than the sum of its proper divisors (498257123).

640614429 is a wasteful number, since it uses less digits than its factorization.

640614429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782217 (or 782214 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 640614429 is about 25310.3620874929. The cubic root of 640614429 is about 862.0495684625.

The spelling of 640614429 in words is "six hundred forty million, six hundred fourteen thousand, four hundred twenty-nine".