28405473 has 8 divisors (see below), whose sum is σ = 37904928. Its totient is φ = 18921504.

The previous prime is 28405469. The next prime is 28405493. The reversal of 28405473 is 37450482.

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

It is not a de Polignac number, because 28405473 - 2² = 28405469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28405423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1461 + ... + 7677.

It is an arithmetic number, because the mean of its divisors is an integer number (4738116).

Almost surely, 2^28405473 is an apocalyptic number.

It is an amenable number.

28405473 is a deficient number, since it is larger than the sum of its proper divisors (9499455).

28405473 is a wasteful number, since it uses less digits than its factorization.

28405473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743.

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 28405473 is about 5329.6785081279. The cubic root of 28405473 is about 305.1176577326.

The spelling of 28405473 in words is "twenty-eight million, four hundred five thousand, four hundred seventy-three".