623440720 has 120 divisors (see below), whose sum is σ = 1698567624. Its totient is φ = 212179968.

The previous prime is 623440717. The next prime is 623440747. The reversal of 623440720 is 27044326.

It can be written as a sum of positive squares in 4 ways, for example, as 14930496 + 608510224 = 3864^2 + 24668^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 614934 + ... + 615946.

Almost surely, 2^623440720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623440720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849283812).

623440720 is an abundant number, since it is smaller than the sum of its proper divisors (1075126904).

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

623440720 is a wasteful number, since it uses less digits than its factorization.

623440720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1184 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 623440720 is about 24968.7949248657. The cubic root of 623440720 is about 854.2763595420.

The spelling of 623440720 in words is "six hundred twenty-three million, four hundred forty thousand, seven hundred twenty".