623257643 has 2 divisors, whose sum is σ = 623257644. Its totient is φ = 623257642.

The previous prime is 623257631. The next prime is 623257669. The reversal of 623257643 is 346752326.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 623257643 - 2²⁶ = 556148779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 623257597 and 623257606.

It is not a weakly prime, because it can be changed into another prime (623257673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311628821 + 311628822.

It is an arithmetic number, because the mean of its divisors is an integer number (311628822).

Almost surely, 2^623257643 is an apocalyptic number.

623257643 is a deficient number, since it is larger than the sum of its proper divisors (1).

623257643 is an equidigital number, since it uses as much as digits as its factorization.

623257643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 38.

The square root of 623257643 is about 24965.1285396250. The cubic root of 623257643 is about 854.1927302785.

The spelling of 623257643 in words is "six hundred twenty-three million, two hundred fifty-seven thousand, six hundred forty-three".