28922400 has 288 divisors, whose sum is σ = 113742720. Its totient is φ = 7050240.

The previous prime is 28922371. The next prime is 28922407. The reversal of 28922400 is 422982.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28922407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 280749 + ... + 280851.

It is an arithmetic number, because the mean of its divisors is an integer number (394940).

Almost surely, 2^28922400 is an apocalyptic number.

28922400 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 28922400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56871360).

28922400 is an abundant number, since it is smaller than the sum of its proper divisors (84820320).

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

28922400 is a wasteful number, since it uses less digits than its factorization.

28922400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28922400 is about 5377.9550016712. The cubic root of 28922400 is about 306.9574012413.

The spelling of 28922400 in words is "twenty-eight million, nine hundred twenty-two thousand, four hundred".