623664601 has 18 divisors (see below), whose sum is σ = 770690958. Its totient is φ = 503112960.

The previous prime is 623664599. The next prime is 623664649. The reversal of 623664601 is 106466326.

It can be written as a sum of positive squares in 3 ways, for example, as 268304400 + 355360201 = 16380^2 + 18851^2 .

It is not a de Polignac number, because 623664601 - 2¹ = 623664599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623664661) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7860 + ... + 36181.

Almost surely, 2^623664601 is an apocalyptic number.

It is an amenable number.

623664601 is a deficient number, since it is larger than the sum of its proper divisors (147026357).

623664601 is a wasteful number, since it uses less digits than its factorization.

623664601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44089 (or 44065 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 623664601 is about 24973.2777384147. The cubic root of 623664601 is about 854.3786057542.

It can be divided in two parts, 62 and 3664601, that added together give a palindrome (3664663).

The spelling of 623664601 in words is "six hundred twenty-three million, six hundred sixty-four thousand, six hundred one".