28418109 has 8 divisors (see below), whose sum is σ = 38915040. Its totient is φ = 18433296.

The previous prime is 28418107. The next prime is 28418111. The reversal of 28418109 is 90181482.

It is an interprime number because it is at equal distance from previous prime (28418107) and next prime (28418111).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28418109 - 2¹ = 28418107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28418109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28418107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127899 + ... + 128120.

It is an arithmetic number, because the mean of its divisors is an integer number (4864380).

Almost surely, 2^28418109 is an apocalyptic number.

It is an amenable number.

28418109 is a deficient number, since it is larger than the sum of its proper divisors (10496931).

28418109 is a wasteful number, since it uses less digits than its factorization.

28418109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256059.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 28418109 is about 5330.8638136797. The cubic root of 28418109 is about 305.1628942635.

The spelling of 28418109 in words is "twenty-eight million, four hundred eighteen thousand, one hundred nine".