640157703 has 8 divisors (see below), whose sum is σ = 854898816. Its totient is φ = 426094200.

The previous prime is 640157663. The next prime is 640157711. The reversal of 640157703 is 307751046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640157703 - 2⁹ = 640157191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640157783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167193 + ... + 170978.

It is an arithmetic number, because the mean of its divisors is an integer number (106862352).

Almost surely, 2^640157703 is an apocalyptic number.

640157703 is a deficient number, since it is larger than the sum of its proper divisors (214741113).

640157703 is a wasteful number, since it uses less digits than its factorization.

640157703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338805.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 640157703 is about 25301.3379685739. The cubic root of 640157703 is about 861.8446537025.

The spelling of 640157703 in words is "six hundred forty million, one hundred fifty-seven thousand, seven hundred three".