623236231640 has 128 divisors (see below), whose sum is σ = 1563520320000. Its totient is φ = 221668761600.

The previous prime is 623236231619. The next prime is 623236231643. The reversal of 623236231640 is 46132632326.

It is a junction number, because it is equal to n+sod(n) for n = 623236231594 and 623236231603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623236231643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5105720 + ... + 5226360.

It is an arithmetic number, because the mean of its divisors is an integer number (12215002500).

Almost surely, 2^623236231640 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 623236231640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781760160000).

623236231640 is an abundant number, since it is smaller than the sum of its proper divisors (940284088360).

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

623236231640 is a wasteful number, since it uses less digits than its factorization.

623236231640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120921 (or 120917 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 38.

Adding to 623236231640 its reverse (46132632326), we get a palindrome (669368863966).

The spelling of 623236231640 in words is "six hundred twenty-three billion, two hundred thirty-six million, two hundred thirty-one thousand, six hundred forty".