28207280 has 40 divisors (see below), whose sum is σ = 66250224. Its totient is φ = 11168000.

The previous prime is 28207261. The next prime is 28207327. The reversal of 28207280 is 8270282.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6335 + ... + 9825.

Almost surely, 2^28207280 is an apocalyptic number.

28207280 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 28207280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33125112).

28207280 is an abundant number, since it is smaller than the sum of its proper divisors (38042944).

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

28207280 is a wasteful number, since it uses less digits than its factorization.

28207280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605 (or 3599 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 28207280 is about 5311.0526263633. The cubic root of 28207280 is about 304.4063702107.

The spelling of 28207280 in words is "twenty-eight million, two hundred seven thousand, two hundred eighty".