28388633 has 8 divisors (see below), whose sum is σ = 34939968. Its totient is φ = 22461264.

The previous prime is 28388629. The next prime is 28388639. The reversal of 28388633 is 33688382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28388633 - 2² = 28388629 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28388639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155891 + ... + 156072.

It is an arithmetic number, because the mean of its divisors is an integer number (4367496).

Almost surely, 2^28388633 is an apocalyptic number.

It is an amenable number.

28388633 is a deficient number, since it is larger than the sum of its proper divisors (6551335).

28388633 is a wasteful number, since it uses less digits than its factorization.

28388633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311983.

The product of its digits is 165888, while the sum is 41.

The square root of 28388633 is about 5328.0984412828. The cubic root of 28388633 is about 305.0573501401.

The spelling of 28388633 in words is "twenty-eight million, three hundred eighty-eight thousand, six hundred thirty-three".