640787000 has 64 divisors (see below), whose sum is σ = 1713666240. Its totient is φ = 219696000.

The previous prime is 640786997. The next prime is 640787003. The reversal of 640787000 is 787046.

It is an interprime number because it is at equal distance from previous prime (640786997) and next prime (640787003).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640787003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38771 + ... + 52770.

It is an arithmetic number, because the mean of its divisors is an integer number (26776035).

Almost surely, 2^640787000 is an apocalyptic number.

It is an amenable number.

640787000 is an abundant number, since it is smaller than the sum of its proper divisors (1072879240).

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

640787000 is a wasteful number, since it uses less digits than its factorization.

640787000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91569 (or 91555 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 640787000 is about 25313.7709557466. The cubic root of 640787000 is about 862.1269688421.

The spelling of 640787000 in words is "six hundred forty million, seven hundred eighty-seven thousand".