28109029 has 16 divisors (see below), whose sum is σ = 31046400. Its totient is φ = 25292736.

The previous prime is 28109023. The next prime is 28109047. The reversal of 28109029 is 92090182.

It is a cyclic number.

It is not a de Polignac number, because 28109029 - 2³ = 28109021 is a prime.

It is a super-2 number, since 2×28109029² = 1580235022645682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28109021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117492 + ... + 117730.

It is an arithmetic number, because the mean of its divisors is an integer number (1940400).

Almost surely, 2^28109029 is an apocalyptic number.

It is an amenable number.

28109029 is a deficient number, since it is larger than the sum of its proper divisors (2937371).

28109029 is a wasteful number, since it uses less digits than its factorization.

28109029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 28109029 is about 5301.7948847537. The cubic root of 28109029 is about 304.0525251174.

The spelling of 28109029 in words is "twenty-eight million, one hundred nine thousand, twenty-nine".