28809612 has 36 divisors (see below), whose sum is σ = 78427440. Its totient is φ = 8864352.

The previous prime is 28809587. The next prime is 28809617. The reversal of 28809612 is 21690882.

It is a tau number, because it is divible by the number of its divisors (36).

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 (28809617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30312 + ... + 31247.

It is an arithmetic number, because the mean of its divisors is an integer number (2178540).

Almost surely, 2^28809612 is an apocalyptic number.

It is an amenable number.

28809612 is an abundant number, since it is smaller than the sum of its proper divisors (49617828).

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

28809612 is a wasteful number, since it uses less digits than its factorization.

28809612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61582 (or 61577 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28809612 is about 5367.4586165149. The cubic root of 28809612 is about 306.5578699342.

The spelling of 28809612 in words is "twenty-eight million, eight hundred nine thousand, six hundred twelve".