28880613 has 6 divisors (see below), whose sum is σ = 41716454. Its totient is φ = 19253736.

The previous prime is 28880611. The next prime is 28880629. The reversal of 28880613 is 31608882.

It can be written as a sum of positive squares in only one way, i.e., 22439169 + 6441444 = 4737^2 + 2538^2 .

It is not a de Polignac number, because 28880613 - 2¹ = 28880611 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28880611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1604470 + ... + 1604487.

Almost surely, 2^28880613 is an apocalyptic number.

It is an amenable number.

28880613 is a deficient number, since it is larger than the sum of its proper divisors (12835841).

28880613 is a wasteful number, since it uses less digits than its factorization.

28880613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208963 (or 3208960 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28880613 is about 5374.0685704594. The cubic root of 28880613 is about 306.8094996002.

The spelling of 28880613 in words is "twenty-eight million, eight hundred eighty thousand, six hundred thirteen".