634528857 has 4 divisors (see below), whose sum is σ = 846038480. Its totient is φ = 423019236.

The previous prime is 634528849. The next prime is 634528871. The reversal of 634528857 is 758825436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 634528857 - 2³ = 634528849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634528877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105754807 + ... + 105754812.

It is an arithmetic number, because the mean of its divisors is an integer number (211509620).

Almost surely, 2^634528857 is an apocalyptic number.

It is an amenable number.

634528857 is a deficient number, since it is larger than the sum of its proper divisors (211509623).

634528857 is a wasteful number, since it uses less digits than its factorization.

634528857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211509622.

The product of its digits is 1612800, while the sum is 48.

The square root of 634528857 is about 25189.8562322217. The cubic root of 634528857 is about 859.3111741327.

The spelling of 634528857 in words is "six hundred thirty-four million, five hundred twenty-eight thousand, eight hundred fifty-seven".