28025380 has 24 divisors (see below), whose sum is σ = 61951680. Its totient is φ = 10620000.

The previous prime is 28025353. The next prime is 28025381. The reversal of 28025380 is 8352082.

It is not an unprimeable number, because it can be changed into a prime (28025381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36496 + ... + 37255.

It is an arithmetic number, because the mean of its divisors is an integer number (2581320).

Almost surely, 2^28025380 is an apocalyptic number.

28025380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28025380 is an abundant number, since it is smaller than the sum of its proper divisors (33926300).

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

28025380 is a wasteful number, since it uses less digits than its factorization.

28025380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73779 (or 73777 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28025380 is about 5293.9002635108. The cubic root of 28025380 is about 303.7506178472.

The spelling of 28025380 in words is "twenty-eight million, twenty-five thousand, three hundred eighty".