28946257 has 4 divisors (see below), whose sum is σ = 30648996. Its totient is φ = 27243520.

The previous prime is 28946251. The next prime is 28946261. The reversal of 28946257 is 75264982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12103441 + 16842816 = 3479^2 + 4104^2 .

It is not a de Polignac number, because 28946257 - 2³ = 28946249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28946251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851344 + ... + 851377.

It is an arithmetic number, because the mean of its divisors is an integer number (7662249).

Almost surely, 2^28946257 is an apocalyptic number.

It is an amenable number.

28946257 is a deficient number, since it is larger than the sum of its proper divisors (1702739).

28946257 is a wasteful number, since it uses less digits than its factorization.

28946257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702738.

The product of its digits is 241920, while the sum is 43.

The square root of 28946257 is about 5380.1725808751. The cubic root of 28946257 is about 307.0417772513.

The spelling of 28946257 in words is "twenty-eight million, nine hundred forty-six thousand, two hundred fifty-seven".