28477789 has 8 divisors (see below), whose sum is σ = 30469280. Its totient is φ = 26535600.

The previous prime is 28477781. The next prime is 28477807. The reversal of 28477789 is 98777482.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28477789 - 2³ = 28477781 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 (28477781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11127 + ... + 13444.

It is an arithmetic number, because the mean of its divisors is an integer number (3808660).

Almost surely, 2^28477789 is an apocalyptic number.

It is an amenable number.

28477789 is a deficient number, since it is larger than the sum of its proper divisors (1991491).

28477789 is a wasteful number, since it uses less digits than its factorization.

28477789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24651.

The product of its digits is 1580544, while the sum is 52.

The square root of 28477789 is about 5336.4584698094. The cubic root of 28477789 is about 305.3763659794.

The spelling of 28477789 in words is "twenty-eight million, four hundred seventy-seven thousand, seven hundred eighty-nine".