28200780 has 36 divisors (see below), whose sum is σ = 85542912. Its totient is φ = 7520160.

The previous prime is 28200779. The next prime is 28200787. The reversal of 28200780 is 8700282.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28200787) 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, 78156 + ... + 78515.

It is an arithmetic number, because the mean of its divisors is an integer number (2376192).

Almost surely, 2^28200780 is an apocalyptic number.

28200780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28200780 is an abundant number, since it is smaller than the sum of its proper divisors (57342132).

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

28200780 is a wasteful number, since it uses less digits than its factorization.

28200780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156686 (or 156681 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 28200780 is about 5310.4406596816. The cubic root of 28200780 is about 304.3829862544.

The spelling of 28200780 in words is "twenty-eight million, two hundred thousand, seven hundred eighty".