623137640 has 32 divisors (see below), whose sum is σ = 1415681280. Its totient is φ = 246833472.

The previous prime is 623137633. The next prime is 623137663. The reversal of 623137640 is 46731326.

It is a junction number, because it is equal to n+sod(n) for n = 623137597 and 623137606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71504 + ... + 79743.

It is an arithmetic number, because the mean of its divisors is an integer number (44240040).

Almost surely, 2^623137640 is an apocalyptic number.

It is an amenable number.

623137640 is an abundant number, since it is smaller than the sum of its proper divisors (792543640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

623137640 is a wasteful number, since it uses less digits than its factorization.

623137640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151361 (or 151357 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 623137640 is about 24962.7250115047. The cubic root of 623137640 is about 854.1379042255.

Adding to 623137640 its reverse (46731326), we get a palindrome (669868966).

The spelling of 623137640 in words is "six hundred twenty-three million, one hundred thirty-seven thousand, six hundred forty".