28736917 has 16 divisors (see below), whose sum is σ = 32230080. Its totient is φ = 25401600.

The previous prime is 28736909. The next prime is 28736921. The reversal of 28736917 is 71963782.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28736917 - 2³ = 28736909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28736927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75634 + ... + 76012.

It is an arithmetic number, because the mean of its divisors is an integer number (2014380).

Almost surely, 2^28736917 is an apocalyptic number.

It is an amenable number.

28736917 is a deficient number, since it is larger than the sum of its proper divisors (3493163).

28736917 is a wasteful number, since it uses less digits than its factorization.

28736917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its digits is 127008, while the sum is 43.

The square root of 28736917 is about 5360.6825125165. The cubic root of 28736917 is about 306.2998079755.

The spelling of 28736917 in words is "twenty-eight million, seven hundred thirty-six thousand, nine hundred seventeen".