640762 has 8 divisors (see below), whose sum is σ = 964692. Its totient is φ = 319200.

The previous prime is 640741. The next prime is 640771. The reversal of 640762 is 267046.

It can be written as a sum of positive squares in 2 ways, for example, as 358801 + 281961 = 599^2 + 531^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462 + ... + 1222.

2⁶⁴⁰⁷⁶² is an apocalyptic number.

640762 is a deficient number, since it is larger than the sum of its proper divisors (323930).

640762 is a wasteful number, since it uses less digits than its factorization.

640762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 640762 is about 800.4761083255. The cubic root of 640762 is about 86.2115756872.

The spelling of 640762 in words is "six hundred forty thousand, seven hundred sixty-two".