623443681 has 16 divisors (see below), whose sum is σ = 744816384. Its totient is φ = 510231744.

The previous prime is 623443679. The next prime is 623443693. The reversal of 623443681 is 186344326.

It is a cyclic number.

It is not a de Polignac number, because 623443681 - 2¹ = 623443679 is a prime.

It is a super-2 number, since 2×623443681² = 777364046757659522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 623443681.

It is not an unprimeable number, because it can be changed into a prime (623443631) 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, 95535 + ... + 101851.

It is an arithmetic number, because the mean of its divisors is an integer number (46551024).

Almost surely, 2^623443681 is an apocalyptic number.

It is an amenable number.

623443681 is a deficient number, since it is larger than the sum of its proper divisors (121372703).

623443681 is a wasteful number, since it uses less digits than its factorization.

623443681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6960.

The product of its digits is 82944, while the sum is 37.

The square root of 623443681 is about 24968.8542188063. The cubic root of 623443681 is about 854.2777119872.

The spelling of 623443681 in words is "six hundred twenty-three million, four hundred forty-three thousand, six hundred eighty-one".