28420590 has 64 divisors (see below), whose sum is σ = 75520512. Its totient is φ = 6787200.

The previous prime is 28420589. The next prime is 28420603. The reversal of 28420590 is 9502482.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22824 + ... + 24036.

It is an arithmetic number, because the mean of its divisors is an integer number (1180008).

Almost surely, 2^28420590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28420590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37760256).

28420590 is an abundant number, since it is smaller than the sum of its proper divisors (47099922).

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

28420590 is a wasteful number, since it uses less digits than its factorization.

28420590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28420590 is about 5331.0965101000. The cubic root of 28420590 is about 305.1717745999.

The spelling of 28420590 in words is "twenty-eight million, four hundred twenty thousand, five hundred ninety".