28257406 has 4 divisors (see below), whose sum is σ = 42386112. Its totient is φ = 14128702.

The previous prime is 28257391. The next prime is 28257413. The reversal of 28257406 is 60475282.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7064350 + ... + 7064353.

It is an arithmetic number, because the mean of its divisors is an integer number (10596528).

Almost surely, 2^28257406 is an apocalyptic number.

28257406 is a deficient number, since it is larger than the sum of its proper divisors (14128706).

28257406 is a wasteful number, since it uses less digits than its factorization.

28257406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14128705.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 28257406 is about 5315.7695585870. The cubic root of 28257406 is about 304.5865795291.

The spelling of 28257406 in words is "twenty-eight million, two hundred fifty-seven thousand, four hundred six".