28272810 has 32 divisors (see below), whose sum is σ = 69691392. Its totient is φ = 7335360.

The previous prime is 28272799. The next prime is 28272823. The reversal of 28272810 is 1827282.

It is a happy number.

It is a super-2 number, since 2×28272810² = 1598703570592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11626 + ... + 13845.

It is an arithmetic number, because the mean of its divisors is an integer number (2177856).

Almost surely, 2^28272810 is an apocalyptic number.

28272810 is an abundant number, since it is smaller than the sum of its proper divisors (41418582).

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

28272810 is a wasteful number, since it uses less digits than its factorization.

28272810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25518.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28272810 is about 5317.2182576983. The cubic root of 28272810 is about 304.6419160471.

The spelling of 28272810 in words is "twenty-eight million, two hundred seventy-two thousand, eight hundred ten".