28390912 has 60 divisors (see below), whose sum is σ = 62767188. Its totient is φ = 12723200.

The previous prime is 28390909. The next prime is 28390919. The reversal of 28390912 is 21909382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399837 + ... + 399907.

Almost surely, 2^28390912 is an apocalyptic number.

28390912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28390912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31383594).

28390912 is an abundant number, since it is smaller than the sum of its proper divisors (34376276).

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

28390912 is an frugal number, since it uses more digits than its factorization.

28390912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 28390912 is about 5328.3123031594. The cubic root of 28390912 is about 305.0655131150.

The spelling of 28390912 in words is "twenty-eight million, three hundred ninety thousand, nine hundred twelve".