28783257 has 8 divisors (see below), whose sum is σ = 38407776. Its totient is φ = 19173792.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783257 is 75238782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28783257 - 2¹¹ = 28781209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28783217) 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, 1933 + ... + 7829.

It is an arithmetic number, because the mean of its divisors is an integer number (4800972).

Almost surely, 2^28783257 is an apocalyptic number.

It is an amenable number.

28783257 is a deficient number, since it is larger than the sum of its proper divisors (9624519).

28783257 is a wasteful number, since it uses less digits than its factorization.

28783257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7527.

The product of its digits is 188160, while the sum is 42.

The square root of 28783257 is about 5365.0029822918. The cubic root of 28783257 is about 306.4643618188.

The spelling of 28783257 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred fifty-seven".