28072732 has 36 divisors (see below), whose sum is σ = 51993480. Its totient is φ = 13258080.

The previous prime is 28072727. The next prime is 28072757. The reversal of 28072732 is 23727082.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 28072694 and 28072703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257494 + ... + 257602.

Almost surely, 2^28072732 is an apocalyptic number.

It is an amenable number.

28072732 is a deficient number, since it is larger than the sum of its proper divisors (23920748).

28072732 is a wasteful number, since it uses less digits than its factorization.

28072732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 28072732 is about 5298.3706929584. The cubic root of 28072732 is about 303.9215950850.

The spelling of 28072732 in words is "twenty-eight million, seventy-two thousand, seven hundred thirty-two".