28070113 has 4 divisors (see below), whose sum is σ = 28215748. Its totient is φ = 27924480.

The previous prime is 28070101. The next prime is 28070129. The reversal of 28070113 is 31107082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 25735329 = 1528^2 + 5073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28070113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28070183) 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 3 ways as a sum of consecutive naturals, for example, 72528 + ... + 72913.

It is an arithmetic number, because the mean of its divisors is an integer number (7053937).

Almost surely, 2^28070113 is an apocalyptic number.

It is an amenable number.

28070113 is a deficient number, since it is larger than the sum of its proper divisors (145635).

28070113 is a wasteful number, since it uses less digits than its factorization.

28070113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145634.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 28070113 is about 5298.1235357436. The cubic root of 28070113 is about 303.9121435003.

Adding to 28070113 its reverse (31107082), we get a palindrome (59177195).

The spelling of 28070113 in words is "twenty-eight million, seventy thousand, one hundred thirteen".