622640331 has 8 divisors (see below), whose sum is σ = 922430160. Its totient is φ = 415093536.

The previous prime is 622640311. The next prime is 622640341. The reversal of 622640331 is 133046226.

622640331 is a `hidden beast` number, since 6 + 226 + 403 + 31 = 666.

It is not a de Polignac number, because 622640331 - 2⁵ = 622640299 is a prime.

It is a super-2 number, since 2×622640331² = 775361963575579122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 23060753 = 622640331 / (6 + 2 + 2 + 6 + 4 + 0 + 3 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 622640295 and 622640304.

It is not an unprimeable number, because it can be changed into a prime (622640311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11530350 + ... + 11530403.

It is an arithmetic number, because the mean of its divisors is an integer number (115303770).

Almost surely, 2^622640331 is an apocalyptic number.

622640331 is a deficient number, since it is larger than the sum of its proper divisors (299789829).

622640331 is a wasteful number, since it uses less digits than its factorization.

622640331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23060762 (or 23060756 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 622640331 is about 24952.7619914109. The cubic root of 622640331 is about 853.9106224346.

Adding to 622640331 its reverse (133046226), we get a palindrome (755686557).

The spelling of 622640331 in words is "six hundred twenty-two million, six hundred forty thousand, three hundred thirty-one".