640833413 has 4 divisors (see below), whose sum is σ = 699091008. Its totient is φ = 582575820.

The previous prime is 640833373. The next prime is 640833419. The reversal of 640833413 is 314338046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640833413 - 2¹⁴ = 640817029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640833413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640833419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29128781 + ... + 29128802.

It is an arithmetic number, because the mean of its divisors is an integer number (174772752).

Almost surely, 2^640833413 is an apocalyptic number.

It is an amenable number.

640833413 is a deficient number, since it is larger than the sum of its proper divisors (58257595).

640833413 is a wasteful number, since it uses less digits than its factorization.

640833413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58257594.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 640833413 is about 25314.6876931160. The cubic root of 640833413 is about 862.1477833160.

The spelling of 640833413 in words is "six hundred forty million, eight hundred thirty-three thousand, four hundred thirteen".