28249929 has 6 divisors (see below), whose sum is σ = 40805466. Its totient is φ = 18833280.

The previous prime is 28249919. The next prime is 28249939. The reversal of 28249929 is 92994282.

It is an interprime number because it is at equal distance from previous prime (28249919) and next prime (28249939).

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 12089529 = 4020^2 + 3477^2 .

It is not a de Polignac number, because 28249929 - 2¹¹ = 28247881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28249919) 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, 1569432 + ... + 1569449.

It is an arithmetic number, because the mean of its divisors is an integer number (6800911).

Almost surely, 2^28249929 is an apocalyptic number.

It is an amenable number.

28249929 is a deficient number, since it is larger than the sum of its proper divisors (12555537).

28249929 is a wasteful number, since it uses less digits than its factorization.

28249929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138887 (or 3138884 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 28249929 is about 5315.0662272450. The cubic root of 28249929 is about 304.5597122982.

The spelling of 28249929 in words is "twenty-eight million, two hundred forty-nine thousand, nine hundred twenty-nine".