640050231 has 16 divisors (see below), whose sum is σ = 876481920. Its totient is φ = 415303200.

The previous prime is 640050217. The next prime is 640050241. The reversal of 640050231 is 132050046.

It is a happy number.

It is not a de Polignac number, because 640050231 - 2⁵ = 640050199 is a prime.

It is a super-2 number, since 2×640050231² = 819328596406306722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640050198 and 640050207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640050241) 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, 25 + ... + 35778.

It is an arithmetic number, because the mean of its divisors is an integer number (54780120).

Almost surely, 2^640050231 is an apocalyptic number.

640050231 is a deficient number, since it is larger than the sum of its proper divisors (236431689).

640050231 is a wasteful number, since it uses less digits than its factorization.

640050231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35966.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 640050231 is about 25299.2140391752. The cubic root of 640050231 is about 861.7964211331.

The spelling of 640050231 in words is "six hundred forty million, fifty thousand, two hundred thirty-one".