22878720 has 160 divisors (see below), whose sum is σ = 81512640. Its totient is φ = 6082560.

The previous prime is 22878683. The next prime is 22878727. The reversal of 22878720 is 2787822.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (22878727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68955 + ... + 69285.

It is an arithmetic number, because the mean of its divisors is an integer number (509454).

Almost surely, 2^22878720 is an apocalyptic number.

22878720 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 22878720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40756320).

22878720 is an abundant number, since it is smaller than the sum of its proper divisors (58633920).

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

22878720 is an equidigital number, since it uses as much as digits as its factorization.

22878720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 22878720 is about 4783.1704966476. The cubic root of 22878720 is about 283.8859556647.

The spelling of 22878720 in words is "twenty-two million, eight hundred seventy-eight thousand, seven hundred twenty".