28911748 has 6 divisors (see below), whose sum is σ = 50595566. Its totient is φ = 14455872.

The previous prime is 28911733. The next prime is 28911761. The reversal of 28911748 is 84711982.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 8191044 = 4552^2 + 2862^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28911748.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3613965 + ... + 3613972.

Almost surely, 2^28911748 is an apocalyptic number.

It is an amenable number.

28911748 is a deficient number, since it is larger than the sum of its proper divisors (21683818).

28911748 is a wasteful number, since it uses less digits than its factorization.

28911748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7227941 (or 7227939 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 28911748 is about 5376.9645712056. The cubic root of 28911748 is about 306.9197129014.

The spelling of 28911748 in words is "twenty-eight million, nine hundred eleven thousand, seven hundred forty-eight".