28407791 has 8 divisors (see below), whose sum is σ = 29459280. Its totient is φ = 27361152.

The previous prime is 28407763. The next prime is 28407839. The reversal of 28407791 is 19770482.

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

It is not a de Polignac number, because 28407791 - 2¹⁸ = 28145647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28407721) 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, 14231 + ... + 16103.

It is an arithmetic number, because the mean of its divisors is an integer number (3682410).

Almost surely, 2^28407791 is an apocalyptic number.

28407791 is a deficient number, since it is larger than the sum of its proper divisors (1051489).

28407791 is a wasteful number, since it uses less digits than its factorization.

28407791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 28407791 is about 5329.8959652136. The cubic root of 28407791 is about 305.1259571131.

The spelling of 28407791 in words is "twenty-eight million, four hundred seven thousand, seven hundred ninety-one".