634790257 has 4 divisors (see below), whose sum is σ = 637260516. Its totient is φ = 632320000.

The previous prime is 634790231. The next prime is 634790267. The reversal of 634790257 is 752097436.

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 489250161 + 145540096 = 22119^2 + 12064^2 .

It is a cyclic number.

It is not a de Polignac number, because 634790257 - 2¹⁵ = 634757489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634790207) 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, 1234744 + ... + 1235257.

It is an arithmetic number, because the mean of its divisors is an integer number (159315129).

Almost surely, 2^634790257 is an apocalyptic number.

It is an amenable number.

634790257 is a deficient number, since it is larger than the sum of its proper divisors (2470259).

634790257 is a wasteful number, since it uses less digits than its factorization.

634790257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470258.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 634790257 is about 25195.0442944639. The cubic root of 634790257 is about 859.4291583138.

The spelling of 634790257 in words is "six hundred thirty-four million, seven hundred ninety thousand, two hundred fifty-seven".