28911633 has 8 divisors (see below), whose sum is σ = 38613600. Its totient is φ = 19242048.

The previous prime is 28911629. The next prime is 28911643. The reversal of 28911633 is 33611982.

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

It is not a de Polignac number, because 28911633 - 2² = 28911629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28911594 and 28911603.

It is not an unprimeable number, because it can be changed into a prime (28911643) 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, 5928 + ... + 9641.

It is an arithmetic number, because the mean of its divisors is an integer number (4826700).

Almost surely, 2^28911633 is an apocalyptic number.

It is an amenable number.

28911633 is a deficient number, since it is larger than the sum of its proper divisors (9701967).

28911633 is a wasteful number, since it uses less digits than its factorization.

28911633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16191.

The product of its digits is 7776, while the sum is 33.

The square root of 28911633 is about 5376.9538774291. The cubic root of 28911633 is about 306.9193059640.

The spelling of 28911633 in words is "twenty-eight million, nine hundred eleven thousand, six hundred thirty-three".