28869237 has 32 divisors (see below), whose sum is σ = 44092160. Its totient is φ = 18662400.

The previous prime is 28869223. The next prime is 28869263. The reversal of 28869237 is 73296882.

It is not a de Polignac number, because 28869237 - 2⁴ = 28869221 is a prime.

It is a Duffinian number.

Its product of digits (290304) is a multiple of the sum of its prime divisors (324).

It is a junction number, because it is equal to n+sod(n) for n = 28869192 and 28869201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28869437) 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, 191112 + ... + 191262.

It is an arithmetic number, because the mean of its divisors is an integer number (1377880).

Almost surely, 2^28869237 is an apocalyptic number.

28869237 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28869237 is a deficient number, since it is larger than the sum of its proper divisors (15222923).

28869237 is a wasteful number, since it uses less digits than its factorization.

28869237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 324 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28869237 is about 5373.0100502419. The cubic root of 28869237 is about 306.7692104826.

The spelling of 28869237 in words is "twenty-eight million, eight hundred sixty-nine thousand, two hundred thirty-seven".