28040072 has 16 divisors (see below), whose sum is σ = 55668060. Its totient is φ = 13195264.

The previous prime is 28040069. The next prime is 28040083. The reversal of 28040072 is 27004082.

It can be written as a sum of positive squares in 2 ways, for example, as 25867396 + 2172676 = 5086^2 + 1474^2 .

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, 102953 + ... + 103224.

Almost surely, 2^28040072 is an apocalyptic number.

It is an amenable number.

28040072 is a deficient number, since it is larger than the sum of its proper divisors (27627988).

28040072 is a wasteful number, since it uses less digits than its factorization.

28040072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206200 (or 206196 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 28040072 is about 5295.2877164513. The cubic root of 28040072 is about 303.8036878914.

The spelling of 28040072 in words is "twenty-eight million, forty thousand, seventy-two".