28020807 has 24 divisors (see below), whose sum is σ = 42432000. Its totient is φ = 17796240.

The previous prime is 28020799. The next prime is 28020823. The reversal of 28020807 is 70802082.

It is not a de Polignac number, because 28020807 - 2³ = 28020799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17944 + ... + 19442.

It is an arithmetic number, because the mean of its divisors is an integer number (1768000).

Almost surely, 2^28020807 is an apocalyptic number.

28020807 is a deficient number, since it is larger than the sum of its proper divisors (14411193).

28020807 is a wasteful number, since it uses less digits than its factorization.

28020807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603 (or 1600 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 28020807 is about 5293.4683337109. The cubic root of 28020807 is about 303.7340955956.

Adding to 28020807 its reverse (70802082), we get a palindrome (98822889).

The spelling of 28020807 in words is "twenty-eight million, twenty thousand, eight hundred seven".