28011730 has 16 divisors (see below), whose sum is σ = 50808384. Its totient is φ = 11118640.

The previous prime is 28011721. The next prime is 28011761. The reversal of 28011730 is 3711082.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9382 + ... + 12001.

It is an arithmetic number, because the mean of its divisors is an integer number (3175524).

Almost surely, 2^28011730 is an apocalyptic number.

28011730 is a deficient number, since it is larger than the sum of its proper divisors (22796654).

28011730 is a wasteful number, since it uses less digits than its factorization.

28011730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21521.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 28011730 is about 5292.6108868875. The cubic root of 28011730 is about 303.7012950636.

The spelling of 28011730 in words is "twenty-eight million, eleven thousand, seven hundred thirty".