28783251 has 12 divisors (see below), whose sum is σ = 47515312. Its totient is φ = 16447536.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783251 is 15238782.

It is not a de Polignac number, because 28783251 - 2⁵ = 28783219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28783751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228376 + ... + 228501.

Almost surely, 2^28783251 is an apocalyptic number.

28783251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28783251 is a deficient number, since it is larger than the sum of its proper divisors (18732061).

28783251 is a wasteful number, since it uses less digits than its factorization.

28783251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456890 (or 456887 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28783251 is about 5365.0024231122. The cubic root of 28783251 is about 306.4643405241.

It can be divided in two parts, 287 and 83251, that added together give a palindrome (83538).

The spelling of 28783251 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred fifty-one".