28409732 has 12 divisors (see below), whose sum is σ = 53541516. Its totient is φ = 13112160.

The previous prime is 28409729. The next prime is 28409741. The reversal of 28409732 is 23790482.

It can be written as a sum of positive squares in 2 ways, for example, as 7761796 + 20647936 = 2786^2 + 4544^2 .

It is a super-2 number, since 2×28409732² = 1614225744623648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28409692 and 28409701.

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, 273119 + ... + 273222.

It is an arithmetic number, because the mean of its divisors is an integer number (4461793).

Almost surely, 2^28409732 is an apocalyptic number.

It is an amenable number.

28409732 is a deficient number, since it is larger than the sum of its proper divisors (25131784).

28409732 is a wasteful number, since it uses less digits than its factorization.

28409732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546358 (or 546356 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28409732 is about 5330.0780482091. The cubic root of 28409732 is about 305.1329063334.

The spelling of 28409732 in words is "twenty-eight million, four hundred nine thousand, seven hundred thirty-two".