640372 has 6 divisors (see below), whose sum is σ = 1120658. Its totient is φ = 320184.

The previous prime is 640369. The next prime is 640411. The reversal of 640372 is 273046.

640372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 355216 + 285156 = 596^2 + 534^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80043 + ... + 80050.

2⁶⁴⁰³⁷² is an apocalyptic number.

It is an amenable number.

640372 is a deficient number, since it is larger than the sum of its proper divisors (480286).

640372 is a wasteful number, since it uses less digits than its factorization.

640372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160097 (or 160095 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 640372 is about 800.2324662247. The cubic root of 640372 is about 86.1940812361.

The spelling of 640372 in words is "six hundred forty thousand, three hundred seventy-two".