28257735 has 24 divisors (see below), whose sum is σ = 49699440. Its totient is φ = 13699840.

The previous prime is 28257721. The next prime is 28257743. The reversal of 28257735 is 53775282.

It is not a de Polignac number, because 28257735 - 2⁸ = 28257479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28257693 and 28257702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5970 + ... + 9599.

It is an arithmetic number, because the mean of its divisors is an integer number (2070810).

Almost surely, 2^28257735 is an apocalyptic number.

28257735 is a deficient number, since it is larger than the sum of its proper divisors (21441705).

28257735 is a wasteful number, since it uses less digits than its factorization.

28257735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15599 (or 15588 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 28257735 is about 5315.8005041574. The cubic root of 28257735 is about 304.5877616215.

The spelling of 28257735 in words is "twenty-eight million, two hundred fifty-seven thousand, seven hundred thirty-five".