28428711 has 8 divisors (see below), whose sum is σ = 37979520. Its totient is φ = 18915192.

The previous prime is 28428689. The next prime is 28428739. The reversal of 28428711 is 11782482.

It is a happy number.

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

It is not a de Polignac number, because 28428711 - 2⁵ = 28428679 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28428761) 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, 7491 + ... + 10628.

It is an arithmetic number, because the mean of its divisors is an integer number (4747440).

Almost surely, 2^28428711 is an apocalyptic number.

28428711 is a deficient number, since it is larger than the sum of its proper divisors (9550809).

28428711 is a wasteful number, since it uses less digits than its factorization.

28428711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18645.

The product of its digits is 7168, while the sum is 33.

The square root of 28428711 is about 5331.8581188925. The cubic root of 28428711 is about 305.2008387862.

The spelling of 28428711 in words is "twenty-eight million, four hundred twenty-eight thousand, seven hundred eleven".