28257634 has 4 divisors (see below), whose sum is σ = 42386454. Its totient is φ = 14128816.

The previous prime is 28257611. The next prime is 28257659. The reversal of 28257634 is 43675282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20277009 + 7980625 = 4503^2 + 2825^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28257593 and 28257602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7064407 + ... + 7064410.

Almost surely, 2^28257634 is an apocalyptic number.

28257634 is a deficient number, since it is larger than the sum of its proper divisors (14128820).

28257634 is a wasteful number, since it uses less digits than its factorization.

28257634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14128819.

The product of its digits is 80640, while the sum is 37.

The square root of 28257634 is about 5315.7910041686. The cubic root of 28257634 is about 304.5873987309.

The spelling of 28257634 in words is "twenty-eight million, two hundred fifty-seven thousand, six hundred thirty-four".