28392029 has 4 divisors (see below), whose sum is σ = 28413276. Its totient is φ = 28370784.

The previous prime is 28391981. The next prime is 28392031. The reversal of 28392029 is 92029382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8988004 + 19404025 = 2998^2 + 4405^2 .

It is a cyclic number.

It is not a de Polignac number, because 28392029 - 2⁸ = 28391773 is a prime.

It is a super-2 number, since 2×28392029² = 1612214621473682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28392029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28392079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8474 + ... + 11339.

It is an arithmetic number, because the mean of its divisors is an integer number (7103319).

Almost surely, 2^28392029 is an apocalyptic number.

It is an amenable number.

28392029 is a deficient number, since it is larger than the sum of its proper divisors (21247).

28392029 is a wasteful number, since it uses less digits than its factorization.

28392029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21246.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28392029 is about 5328.4171195581. The cubic root of 28392029 is about 305.0695138519.

The spelling of 28392029 in words is "twenty-eight million, three hundred ninety-two thousand, twenty-nine".