623401440 has 96 divisors (see below), whose sum is σ = 1969422336. Its totient is φ = 165757440.

The previous prime is 623401439. The next prime is 623401447. The reversal of 623401440 is 44104326.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 623401440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623401447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182145 + ... + 185535.

It is an arithmetic number, because the mean of its divisors is an integer number (20514816).

Almost surely, 2^623401440 is an apocalyptic number.

623401440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623401440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984711168).

623401440 is an abundant number, since it is smaller than the sum of its proper divisors (1346020896).

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

623401440 is a wasteful number, since it uses less digits than its factorization.

623401440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792 (or 3784 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 623401440 is about 24968.0083306619. The cubic root of 623401440 is about 854.2584178842.

Adding to 623401440 its reverse (44104326), we get a palindrome (667505766).

The spelling of 623401440 in words is "six hundred twenty-three million, four hundred one thousand, four hundred forty".