28809474 has 8 divisors (see below), whose sum is σ = 57618960. Its totient is φ = 9603156.

The previous prime is 28809467. The next prime is 28809479. The reversal of 28809474 is 47490882.

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

28809474 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28809479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2400784 + ... + 2400795.

It is an arithmetic number, because the mean of its divisors is an integer number (7202370).

Almost surely, 2^28809474 is an apocalyptic number.

28809474 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28809474 is a wasteful number, since it uses less digits than its factorization.

28809474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4801584.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28809474 is about 5367.4457612537. The cubic root of 28809474 is about 306.5573804557.

The spelling of 28809474 in words is "twenty-eight million, eight hundred nine thousand, four hundred seventy-four".