632648257 has 2 divisors, whose sum is σ = 632648258. Its totient is φ = 632648256.

The previous prime is 632648249. The next prime is 632648297. The reversal of 632648257 is 752846236.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335292721 + 297355536 = 18311^2 + 17244^2 .

It is a cyclic number.

It is not a de Polignac number, because 632648257 - 2³ = 632648249 is a prime.

It is the 25153-rd Hogben number.

It is not a weakly prime, because it can be changed into another prime (632648297) by changing a digit.

It is a nontrivial repunit in base 25152.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316324128 + 316324129.

It is an arithmetic number, because the mean of its divisors is an integer number (316324129).

Almost surely, 2^632648257 is an apocalyptic number.

It is an amenable number.

632648257 is a deficient number, since it is larger than the sum of its proper divisors (1).

632648257 is an equidigital number, since it uses as much as digits as its factorization.

632648257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 43.

The square root of 632648257 is about 25152.5000149091. The cubic root of 632648257 is about 858.4613994184.

The spelling of 632648257 in words is "six hundred thirty-two million, six hundred forty-eight thousand, two hundred fifty-seven".