28257938 has 16 divisors (see below), whose sum is σ = 45311616. Its totient is φ = 13184160.

The previous prime is 28257937. The next prime is 28257949. The reversal of 28257938 is 83975282.

It is a super-2 number, since 2×28257938² = 1597022120023688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28257937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5606 + ... + 9377.

It is an arithmetic number, because the mean of its divisors is an integer number (2831976).

Almost surely, 2^28257938 is an apocalyptic number.

28257938 is a deficient number, since it is larger than the sum of its proper divisors (17053678).

28257938 is a wasteful number, since it uses less digits than its factorization.

28257938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15049.

The product of its digits is 241920, while the sum is 44.

The square root of 28257938 is about 5315.8195981429. The cubic root of 28257938 is about 304.5884909931.

The spelling of 28257938 in words is "twenty-eight million, two hundred fifty-seven thousand, nine hundred thirty-eight".