28994720 has 48 divisors (see below), whose sum is σ = 71487360. Its totient is φ = 11092224.

The previous prime is 28994711. The next prime is 28994729. The reversal of 28994720 is 2749982.

It is an interprime number because it is at equal distance from previous prime (28994711) and next prime (28994729).

It is not an unprimeable number, because it can be changed into a prime (28994729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 7619.

It is an arithmetic number, because the mean of its divisors is an integer number (1489320).

Almost surely, 2^28994720 is an apocalyptic number.

28994720 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 28994720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35743680).

28994720 is an abundant number, since it is smaller than the sum of its proper divisors (42492640).

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

28994720 is a wasteful number, since it uses less digits than its factorization.

28994720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7917 (or 7909 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 28994720 is about 5384.6745491255. The cubic root of 28994720 is about 307.2130356520.

The spelling of 28994720 in words is "twenty-eight million, nine hundred ninety-four thousand, seven hundred twenty".