28457805 has 16 divisors (see below), whose sum is σ = 45616320. Its totient is φ = 15149568.

The previous prime is 28457797. The next prime is 28457833. The reversal of 28457805 is 50875482.

It is not a de Polignac number, because 28457805 - 2³ = 28457797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8686 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (2851020).

Almost surely, 2^28457805 is an apocalyptic number.

It is an amenable number.

28457805 is a deficient number, since it is larger than the sum of its proper divisors (17158515).

28457805 is a wasteful number, since it uses less digits than its factorization.

28457805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500.

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 28457805 is about 5334.5857383681. The cubic root of 28457805 is about 305.3049176735.

The spelling of 28457805 in words is "twenty-eight million, four hundred fifty-seven thousand, eight hundred five".