28233387 has 32 divisors (see below), whose sum is σ = 51484160. Its totient is φ = 14891040.

The previous prime is 28233353. The next prime is 28233409. The reversal of 28233387 is 78333282.

It is not a de Polignac number, because 28233387 - 2⁸ = 28233131 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28233347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3289 + ... + 8202.

It is an arithmetic number, because the mean of its divisors is an integer number (1608880).

Almost surely, 2^28233387 is an apocalyptic number.

28233387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28233387 is a deficient number, since it is larger than the sum of its proper divisors (23250773).

28233387 is a wasteful number, since it uses less digits than its factorization.

28233387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520 (or 11514 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 28233387 is about 5313.5098569590. The cubic root of 28233387 is about 304.5002547985.

The spelling of 28233387 in words is "twenty-eight million, two hundred thirty-three thousand, three hundred eighty-seven".