623500644 has 72 divisors (see below), whose sum is σ = 1619304960. Its totient is φ = 185613120.

The previous prime is 623500607. The next prime is 623500649. The reversal of 623500644 is 446005326.

623500644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×623500644³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (623500649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147837 + ... + 151995.

Almost surely, 2^623500644 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 623500644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809652480).

623500644 is an abundant number, since it is smaller than the sum of its proper divisors (995804316).

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

623500644 is a wasteful number, since it uses less digits than its factorization.

623500644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241 (or 4208 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 623500644 is about 24969.9948738481. The cubic root of 623500644 is about 854.3037291672.

The spelling of 623500644 in words is "six hundred twenty-three million, five hundred thousand, six hundred forty-four".