28542390 has 16 divisors (see below), whose sum is σ = 68501808. Its totient is φ = 7611296.

The previous prime is 28542377. The next prime is 28542391. The reversal of 28542390 is 9324582.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28542391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475677 + ... + 475736.

It is an arithmetic number, because the mean of its divisors is an integer number (4281363).

Almost surely, 2^28542390 is an apocalyptic number.

28542390 is an abundant number, since it is smaller than the sum of its proper divisors (39959418).

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

28542390 is a wasteful number, since it uses less digits than its factorization.

28542390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951423.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 28542390 is about 5342.5078380850. The cubic root of 28542390 is about 305.6071039324.

The spelling of 28542390 in words is "twenty-eight million, five hundred forty-two thousand, three hundred ninety".