28428777 has 24 divisors (see below), whose sum is σ = 46827144. Its totient is φ = 16464384.

The previous prime is 28428761. The next prime is 28428779. The reversal of 28428777 is 77782482.

It can be written as a sum of positive squares in 4 ways, for example, as 9216 + 28419561 = 96^2 + 5331^2 .

It is not a de Polignac number, because 28428777 - 2⁴ = 28428761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28428779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5158 + ... + 9135.

It is an arithmetic number, because the mean of its divisors is an integer number (1951131).

Almost surely, 2^28428777 is an apocalyptic number.

It is an amenable number.

28428777 is a deficient number, since it is larger than the sum of its proper divisors (18398367).

28428777 is a wasteful number, since it uses less digits than its factorization.

28428777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14329 (or 14326 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 28428777 is about 5331.8643081009. The cubic root of 28428777 is about 305.2010749704.

The spelling of 28428777 in words is "twenty-eight million, four hundred twenty-eight thousand, seven hundred seventy-seven".