640370 has 8 divisors (see below), whose sum is σ = 1152684. Its totient is φ = 256144.

The previous prime is 640369. The next prime is 640411. The reversal of 640370 is 73046.

640370 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 2 ways, for example, as 546121 + 94249 = 739^2 + 307^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640370.

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, 32009 + ... + 32028.

2⁶⁴⁰³⁷⁰ is an apocalyptic number.

640370 is a deficient number, since it is larger than the sum of its proper divisors (512314).

640370 is a wasteful number, since it uses less digits than its factorization.

640370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64044.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 640370 is about 800.2312165868. The cubic root of 640370 is about 86.1939915027.

The spelling of 640370 in words is "six hundred forty thousand, three hundred seventy".