33147728 has 10 divisors (see below), whose sum is σ = 64223754. Its totient is φ = 16573856.

The previous prime is 33147707. The next prime is 33147749. The reversal of 33147728 is 82774133.

It is an interprime number because it is at equal distance from previous prime (33147707) and next prime (33147749).

It can be written as a sum of positive squares in only one way, i.e., 32171584 + 976144 = 5672^2 + 988^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1035851 + ... + 1035882.

Almost surely, 2^33147728 is an apocalyptic number.

It is an amenable number.

33147728 is a deficient number, since it is larger than the sum of its proper divisors (31076026).

33147728 is a wasteful number, since it uses less digits than its factorization.

33147728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071741 (or 2071735 counting only the distinct ones).

The product of its digits is 28224, while the sum is 35.

The square root of 33147728 is about 5757.4063605064. The cubic root of 33147728 is about 321.2313494802.

The spelling of 33147728 in words is "thirty-three million, one hundred forty-seven thousand, seven hundred twenty-eight".