28817280 has 96 divisors (see below), whose sum is σ = 99529560. Its totient is φ = 7683072.

The previous prime is 28817273. The next prime is 28817287. The reversal of 28817280 is 8271882.

It is an interprime number because it is at equal distance from previous prime (28817273) and next prime (28817287).

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28817287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3259 + ... + 8261.

Almost surely, 2^28817280 is an apocalyptic number.

28817280 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 28817280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49764780).

28817280 is an abundant number, since it is smaller than the sum of its proper divisors (70712280).

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

28817280 is a wasteful number, since it uses less digits than its factorization.

28817280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028 (or 5013 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28817280 is about 5368.1728735204. The cubic root of 28817280 is about 306.5850654551.

The spelling of 28817280 in words is "twenty-eight million, eight hundred seventeen thousand, two hundred eighty".