28026407 has 4 divisors (see below), whose sum is σ = 28283640. Its totient is φ = 27769176.

The previous prime is 28026377. The next prime is 28026437. The reversal of 28026407 is 70462082.

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

It is an interprime number because it is at equal distance from previous prime (28026377) and next prime (28026437).

It is a cyclic number.

It is not a de Polignac number, because 28026407 - 2⁶ = 28026343 is a prime.

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 28026407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28026437) 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, 128453 + ... + 128670.

It is an arithmetic number, because the mean of its divisors is an integer number (7070910).

Almost surely, 2^28026407 is an apocalyptic number.

28026407 is a deficient number, since it is larger than the sum of its proper divisors (257233).

28026407 is a wasteful number, since it uses less digits than its factorization.

28026407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257232.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 28026407 is about 5293.9972610495. The cubic root of 28026407 is about 303.7543281516.

Adding to 28026407 its sum of digits (29), we get a square (28026436 = 5294²).

Adding to 28026407 its reverse (70462082), we get a palindrome (98488489).

The spelling of 28026407 in words is "twenty-eight million, twenty-six thousand, four hundred seven".