624421431 has 12 divisors (see below), whose sum is σ = 923941200. Its totient is φ = 406127520.

The previous prime is 624421423. The next prime is 624421471. The reversal of 624421431 is 134124426.

It is a happy number.

624421431 is a `hidden beast` number, since 624 + 4 + 2 + 1 + 4 + 31 = 666.

It is not a de Polignac number, because 624421431 - 2³ = 624421423 is a prime.

It is a super-2 number, since 2×624421431² = 779804246984175522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 624421395 and 624421404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624421471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 845731 + ... + 846468.

It is an arithmetic number, because the mean of its divisors is an integer number (76995100).

Almost surely, 2^624421431 is an apocalyptic number.

624421431 is a deficient number, since it is larger than the sum of its proper divisors (299519769).

624421431 is a wasteful number, since it uses less digits than its factorization.

624421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692246 (or 1692243 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 624421431 is about 24988.4259408231. The cubic root of 624421431 is about 854.7240681354.

Adding to 624421431 its reverse (134124426), we get a palindrome (758545857).

The spelling of 624421431 in words is "six hundred twenty-four million, four hundred twenty-one thousand, four hundred thirty-one".