28749429 has 6 divisors (see below), whose sum is σ = 41526966. Its totient is φ = 19166280.

The previous prime is 28749421. The next prime is 28749449. The reversal of 28749429 is 92494782.

It can be written as a sum of positive squares in only one way, i.e., 28068804 + 680625 = 5298^2 + 825^2 .

It is not a de Polignac number, because 28749429 - 2³ = 28749421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28749421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1597182 + ... + 1597199.

It is an arithmetic number, because the mean of its divisors is an integer number (6921161).

Almost surely, 2^28749429 is an apocalyptic number.

It is an amenable number.

28749429 is a deficient number, since it is larger than the sum of its proper divisors (12777537).

28749429 is a wasteful number, since it uses less digits than its factorization.

28749429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194387 (or 3194384 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28749429 is about 5361.8494010929. The cubic root of 28749429 is about 306.3442556468.

It can be divided in two parts, 28749 and 429, that multiplied together give a palindrome (12333321).

The spelling of 28749429 in words is "twenty-eight million, seven hundred forty-nine thousand, four hundred twenty-nine".