28891832 has 8 divisors (see below), whose sum is σ = 54172200. Its totient is φ = 14445912.

The previous prime is 28891813. The next prime is 28891847. The reversal of 28891832 is 23819882.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28891832.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805732 + ... + 1805747.

It is an arithmetic number, because the mean of its divisors is an integer number (6771525).

Almost surely, 2^28891832 is an apocalyptic number.

It is an amenable number.

28891832 is a deficient number, since it is larger than the sum of its proper divisors (25280368).

28891832 is a wasteful number, since it uses less digits than its factorization.

28891832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611485 (or 3611481 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 28891832 is about 5375.1122778971. The cubic root of 28891832 is about 306.8492223277.

The spelling of 28891832 in words is "twenty-eight million, eight hundred ninety-one thousand, eight hundred thirty-two".