624796721 has 2 divisors, whose sum is σ = 624796722. Its totient is φ = 624796720.

The previous prime is 624796687. The next prime is 624796727. The reversal of 624796721 is 127697426.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 593604496 + 31192225 = 24364^2 + 5585^2 .

It is a cyclic number.

It is not a de Polignac number, because 624796721 - 2¹⁴ = 624780337 is a prime.

It is not a weakly prime, because it can be changed into another prime (624796727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312398360 + 312398361.

It is an arithmetic number, because the mean of its divisors is an integer number (312398361).

Almost surely, 2^624796721 is an apocalyptic number.

It is an amenable number.

624796721 is a deficient number, since it is larger than the sum of its proper divisors (1).

624796721 is an equidigital number, since it uses as much as digits as its factorization.

624796721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 624796721 is about 24995.9340893674. The cubic root of 624796721 is about 854.8952693670.

The spelling of 624796721 in words is "six hundred twenty-four million, seven hundred ninety-six thousand, seven hundred twenty-one".