623625641 has 4 divisors (see below), whose sum is σ = 632168532. Its totient is φ = 615082752.

The previous prime is 623625617. The next prime is 623625649. The reversal of 623625641 is 146526326.

It is a happy number.

623625641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 459888025 + 163737616 = 21445^2 + 12796^2 .

It is a cyclic number.

It is not a de Polignac number, because 623625641 - 2¹⁴ = 623609257 is a prime.

It is a super-2 number, since 2×623625641² = 777817880225321762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623625649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271336 + ... + 4271481.

It is an arithmetic number, because the mean of its divisors is an integer number (158042133).

Almost surely, 2^623625641 is an apocalyptic number.

It is an amenable number.

623625641 is a deficient number, since it is larger than the sum of its proper divisors (8542891).

623625641 is an equidigital number, since it uses as much as digits as its factorization.

623625641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8542890.

The product of its digits is 51840, while the sum is 35.

The square root of 623625641 is about 24972.4976924616. The cubic root of 623625641 is about 854.3608145228.

The spelling of 623625641 in words is "six hundred twenty-three million, six hundred twenty-five thousand, six hundred forty-one".