623715440 has 40 divisors (see below), whose sum is σ = 1463462880. Its totient is φ = 247193856.

The previous prime is 623715437. The next prime is 623715457. The reversal of 623715440 is 44517326.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 623715397 and 623715406.

It is a congruent number.

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, 27044 + ... + 44483.

It is an arithmetic number, because the mean of its divisors is an integer number (36586572).

Almost surely, 2^623715440 is an apocalyptic number.

It is an amenable number.

623715440 is an abundant number, since it is smaller than the sum of its proper divisors (839747440).

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

623715440 is a wasteful number, since it uses less digits than its factorization.

623715440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71649 (or 71643 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 623715440 is about 24974.2955856617. The cubic root of 623715440 is about 854.4018204616.

The spelling of 623715440 in words is "six hundred twenty-three million, seven hundred fifteen thousand, four hundred forty".