640142887 has 8 divisors (see below), whose sum is σ = 651473280. Its totient is φ = 628876920.

The previous prime is 640142863. The next prime is 640142917. The reversal of 640142887 is 788241046.

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

It is a cyclic number.

It is not a de Polignac number, because 640142887 - 2⁷ = 640142759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640142287) 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, 4164 + ... + 36022.

It is an arithmetic number, because the mean of its divisors is an integer number (81434160).

Almost surely, 2^640142887 is an apocalyptic number.

640142887 is a deficient number, since it is larger than the sum of its proper divisors (11330393).

640142887 is a wasteful number, since it uses less digits than its factorization.

640142887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32213.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 640142887 is about 25301.0451760397. The cubic root of 640142887 is about 861.8380047217.

The spelling of 640142887 in words is "six hundred forty million, one hundred forty-two thousand, eight hundred eighty-seven".