640200379 has 16 divisors (see below), whose sum is σ = 788585728. Its totient is φ = 506116512.

The previous prime is 640200361. The next prime is 640200389. The reversal of 640200379 is 973002046.

It is a cyclic number.

It is not a de Polignac number, because 640200379 - 2²⁵ = 606645947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640200379.

It is not an unprimeable number, because it can be changed into a prime (640200359) 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, 156964 + ... + 160990.

It is an arithmetic number, because the mean of its divisors is an integer number (49286608).

Almost surely, 2^640200379 is an apocalyptic number.

640200379 is a deficient number, since it is larger than the sum of its proper divisors (148385349).

640200379 is a wasteful number, since it uses less digits than its factorization.

640200379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5794.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 640200379 is about 25302.1813091283. The cubic root of 640200379 is about 861.8638048507.

The spelling of 640200379 in words is "six hundred forty million, two hundred thousand, three hundred seventy-nine".