28072296 has 144 divisors (see below), whose sum is σ = 90476100. Its totient is φ = 7838208.

The previous prime is 28072279. The next prime is 28072309. The reversal of 28072296 is 69227082.

It can be written as a sum of positive squares in 2 ways, for example, as 27562500 + 509796 = 5250^2 + 714^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28072296.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 257490 + ... + 257598.

Almost surely, 2^28072296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28072296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45238050).

28072296 is an abundant number, since it is smaller than the sum of its proper divisors (62403804).

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

28072296 is a wasteful number, since it uses less digits than its factorization.

28072296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28072296 is about 5298.3295480746. The cubic root of 28072296 is about 303.9200216661.

The spelling of 28072296 in words is "twenty-eight million, seventy-two thousand, two hundred ninety-six".