640250411 has 4 divisors (see below), whose sum is σ = 641288712. Its totient is φ = 639212112.

The previous prime is 640250407. The next prime is 640250417. The reversal of 640250411 is 114052046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 114052046 = 2 ⋅57026023.

It is a cyclic number.

It is not a de Polignac number, because 640250411 - 2² = 640250407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640250417) 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, 518225 + ... + 519458.

It is an arithmetic number, because the mean of its divisors is an integer number (160322178).

Almost surely, 2^640250411 is an apocalyptic number.

640250411 is a deficient number, since it is larger than the sum of its proper divisors (1038301).

640250411 is a wasteful number, since it uses less digits than its factorization.

640250411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038300.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 640250411 is about 25303.1699792733. The cubic root of 640250411 is about 861.8862559707.

The spelling of 640250411 in words is "six hundred forty million, two hundred fifty thousand, four hundred eleven".