623409540 has 192 divisors, whose sum is σ = 1944821760. Its totient is φ = 148262400.

The previous prime is 623409539. The next prime is 623409541. The reversal of 623409540 is 45904326.

It is an interprime number because it is at equal distance from previous prime (623409539) and next prime (623409541).

It is not an unprimeable number, because it can be changed into a prime (623409541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4128465 + ... + 4128615.

It is an arithmetic number, because the mean of its divisors is an integer number (10129280).

Almost surely, 2^623409540 is an apocalyptic number.

623409540 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 623409540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972410880).

623409540 is an abundant number, since it is smaller than the sum of its proper divisors (1321412220).

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

623409540 is a wasteful number, since it uses less digits than its factorization.

623409540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 623409540 is about 24968.1705377066. The cubic root of 623409540 is about 854.2621177277.

The spelling of 623409540 in words is "six hundred twenty-three million, four hundred nine thousand, five hundred forty".