28242580 has 24 divisors (see below), whose sum is σ = 59475528. Its totient is φ = 11265408.

The previous prime is 28242553. The next prime is 28242601. The reversal of 28242580 is 8524282.

It can be written as a sum of positive squares in 4 ways, for example, as 1056784 + 27185796 = 1028^2 + 5214^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6162 + ... + 9718.

It is an arithmetic number, because the mean of its divisors is an integer number (2478147).

Almost surely, 2^28242580 is an apocalyptic number.

28242580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28242580 is an abundant number, since it is smaller than the sum of its proper divisors (31232948).

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

28242580 is a wasteful number, since it uses less digits than its factorization.

28242580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963 (or 3961 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 28242580 is about 5314.3748456427. The cubic root of 28242580 is about 304.5333003918.

The spelling of 28242580 in words is "twenty-eight million, two hundred forty-two thousand, five hundred eighty".