623720534621 has 32 divisors (see below), whose sum is σ = 696956400000. Its totient is φ = 554706634752.

The previous prime is 623720534609. The next prime is 623720534623. The reversal of 623720534621 is 126435027326.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-623720534621 is a prime.

It is a super-2 number, since 2×623720534621² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623720534623) 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, 297150230 + ... + 297152328.

It is an arithmetic number, because the mean of its divisors is an integer number (21779887500).

Almost surely, 2^623720534621 is an apocalyptic number.

It is an amenable number.

623720534621 is a deficient number, since it is larger than the sum of its proper divisors (73235865379).

623720534621 is a wasteful number, since it uses less digits than its factorization.

623720534621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 623720534621 in words is "six hundred twenty-three billion, seven hundred twenty million, five hundred thirty-four thousand, six hundred twenty-one".