623755390840 has 64 divisors (see below), whose sum is σ = 1449268704000. Its totient is φ = 241362616320.

The previous prime is 623755390837. The next prime is 623755390847. The reversal of 623755390840 is 48093557326.

It is a super-2 number, since 2×623755390840² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623755390847) 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, 3240826 + ... + 3427894.

It is an arithmetic number, because the mean of its divisors is an integer number (22644823500).

Almost surely, 2^623755390840 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 623755390840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724634352000).

623755390840 is an abundant number, since it is smaller than the sum of its proper divisors (825513313160).

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

623755390840 is a wasteful number, since it uses less digits than its factorization.

623755390840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189800 (or 189796 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 623755390840 in words is "six hundred twenty-three billion, seven hundred fifty-five million, three hundred ninety thousand, eight hundred forty".