28991034 has 40 divisors (see below), whose sum is σ = 65955648. Its totient is φ = 9515880.

The previous prime is 28991021. The next prime is 28991041. The reversal of 28991034 is 43019982.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28991034.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9519 + ... + 12189.

Almost surely, 2^28991034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28991034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32977824).

28991034 is an abundant number, since it is smaller than the sum of its proper divisors (36964614).

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

28991034 is a wasteful number, since it uses less digits than its factorization.

28991034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28991034 is about 5384.3322705791. The cubic root of 28991034 is about 307.2000167847.

The spelling of 28991034 in words is "twenty-eight million, nine hundred ninety-one thousand, thirty-four".