28491045 has 16 divisors (see below), whose sum is σ = 49730112. Its totient is φ = 13813760.

The previous prime is 28491037. The next prime is 28491049. The reversal of 28491045 is 54019482.

It is not a de Polignac number, because 28491045 - 2³ = 28491037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 28490997 and 28491015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28491049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86172 + ... + 86501.

It is an arithmetic number, because the mean of its divisors is an integer number (3108132).

Almost surely, 2^28491045 is an apocalyptic number.

It is an amenable number.

28491045 is a deficient number, since it is larger than the sum of its proper divisors (21239067).

28491045 is a wasteful number, since it uses less digits than its factorization.

28491045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172692.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28491045 is about 5337.7003475280. The cubic root of 28491045 is about 305.4237413938.

The spelling of 28491045 in words is "twenty-eight million, four hundred ninety-one thousand, forty-five".