28737913 has 8 divisors (see below), whose sum is σ = 29090880. Its totient is φ = 28387440.

The previous prime is 28737901. The next prime is 28737931. The reversal of 28737913 is 31973782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28737913 - 2¹⁷ = 28606841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28737113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31956 + ... + 32842.

It is an arithmetic number, because the mean of its divisors is an integer number (3636360).

Almost surely, 2^28737913 is an apocalyptic number.

It is an amenable number.

28737913 is a deficient number, since it is larger than the sum of its proper divisors (352967).

28737913 is a wasteful number, since it uses less digits than its factorization.

28737913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247.

The product of its digits is 63504, while the sum is 40.

The square root of 28737913 is about 5360.7754103301. The cubic root of 28737913 is about 306.3033466419.

The spelling of 28737913 in words is "twenty-eight million, seven hundred thirty-seven thousand, nine hundred thirteen".