28922880 has 176 divisors, whose sum is σ = 106116480. Its totient is φ = 6586368.

The previous prime is 28922879. The next prime is 28922911. The reversal of 28922880 is 8822982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107386 + ... + 107654.

Almost surely, 2^28922880 is an apocalyptic number.

28922880 is a gapful number since it is divisible by the number (20) 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 28922880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53058240).

28922880 is an abundant number, since it is smaller than the sum of its proper divisors (77193600).

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

28922880 is a wasteful number, since it uses less digits than its factorization.

28922880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28922880 is about 5377.9996281145. Note that the first 3 decimals coincide. The cubic root of 28922880 is about 306.9590993339.

The spelling of 28922880 in words is "twenty-eight million, nine hundred twenty-two thousand, eight hundred eighty".