28865790 has 48 divisors (see below), whose sum is σ = 75348000. Its totient is φ = 7667136.

The previous prime is 28865773. The next prime is 28865791. The reversal of 28865790 is 9756882.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28865791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30951 + ... + 31869.

It is an arithmetic number, because the mean of its divisors is an integer number (1569750).

Almost surely, 2^28865790 is an apocalyptic number.

28865790 is an abundant number, since it is smaller than the sum of its proper divisors (46482210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28865790 is a wasteful number, since it uses less digits than its factorization.

28865790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1278 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28865790 is about 5372.6892707470. The cubic root of 28865790 is about 306.7570005357.

The spelling of 28865790 in words is "twenty-eight million, eight hundred sixty-five thousand, seven hundred ninety".