28807280 has 20 divisors (see below), whose sum is σ = 66977112. Its totient is φ = 11522880.

The previous prime is 28807279. The next prime is 28807309. The reversal of 28807280 is 8270882.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 28807280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179966 + ... + 180125.

Almost surely, 2^28807280 is an apocalyptic number.

28807280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28807280 is an abundant number, since it is smaller than the sum of its proper divisors (38169832).

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

28807280 is a wasteful number, since it uses less digits than its factorization.

28807280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360104 (or 360098 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 28807280 is about 5367.2413770949. The cubic root of 28807280 is about 306.5495982476.

The spelling of 28807280 in words is "twenty-eight million, eight hundred seven thousand, two hundred eighty".