22078728 has 96 divisors (see below), whose sum is σ = 69413760. Its totient is φ = 6209280.

The previous prime is 22078723. The next prime is 22078729. The reversal of 22078728 is 82787022.

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

It is a junction number, because it is equal to n+sod(n) for n = 22078692 and 22078701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22078723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35476 + ... + 36092.

It is an arithmetic number, because the mean of its divisors is an integer number (723060).

Almost surely, 2^22078728 is an apocalyptic number.

22078728 is a gapful number since it is divisible by the number (28) 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 22078728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34706880).

22078728 is an abundant number, since it is smaller than the sum of its proper divisors (47335032).

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

22078728 is a wasteful number, since it uses less digits than its factorization.

22078728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 700 counting only the distinct ones).

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

The square root of 22078728 is about 4698.8006980505. The cubic root of 22078728 is about 280.5377759946.

The spelling of 22078728 in words is "twenty-two million, seventy-eight thousand, seven hundred twenty-eight".