28911672 has 24 divisors (see below), whose sum is σ = 78302640. Its totient is φ = 9637200.

The previous prime is 28911671. The next prime is 28911703. The reversal of 28911672 is 27611982.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28911671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200704 + ... + 200847.

It is an arithmetic number, because the mean of its divisors is an integer number (3262610).

Almost surely, 2^28911672 is an apocalyptic number.

It is an amenable number.

28911672 is an abundant number, since it is smaller than the sum of its proper divisors (49390968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28911672 is a wasteful number, since it uses less digits than its factorization.

28911672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401563 (or 401556 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 28911672 is about 5376.9575040166. The cubic root of 28911672 is about 306.9194439690.

The spelling of 28911672 in words is "twenty-eight million, nine hundred eleven thousand, six hundred seventy-two".