28070500 has 48 divisors (see below), whose sum is σ = 63318528. Its totient is φ = 10860000.

The previous prime is 28070491. The next prime is 28070503. The reversal of 28070500 is 507082.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28070503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14595 + ... + 16405.

It is an arithmetic number, because the mean of its divisors is an integer number (1319136).

Almost surely, 2^28070500 is an apocalyptic number.

28070500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28070500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31659264).

28070500 is an abundant number, since it is smaller than the sum of its proper divisors (35248028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28070500 is a wasteful number, since it uses less digits than its factorization.

28070500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861 (or 1849 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28070500 is about 5298.1600579824. The cubic root of 28070500 is about 303.9135401632.

Adding to 28070500 its reverse (507082), we get a palindrome (28577582).

The spelling of 28070500 in words is "twenty-eight million, seventy thousand, five hundred".