28914720 has 96 divisors (see below), whose sum is σ = 92715840. Its totient is φ = 7572480.

The previous prime is 28914719. The next prime is 28914727. The reversal of 28914720 is 2741982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×28914720² = 1672122065356800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28914727) 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, 27810 + ... + 28830.

It is an arithmetic number, because the mean of its divisors is an integer number (965790).

Almost surely, 2^28914720 is an apocalyptic number.

28914720 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 28914720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46357920).

28914720 is an abundant number, since it is smaller than the sum of its proper divisors (63801120).

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

28914720 is a wasteful number, since it uses less digits than its factorization.

28914720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 28914720 is about 5377.2409282084. The cubic root of 28914720 is about 306.9302292047.

The spelling of 28914720 in words is "twenty-eight million, nine hundred fourteen thousand, seven hundred twenty".