28712765 has 8 divisors (see below), whose sum is σ = 34494720. Its totient is φ = 22943952.

The previous prime is 28712759. The next prime is 28712807. The reversal of 28712765 is 56721782.

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 28712765 - 2²⁴ = 11935549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2432 + ... + 7958.

It is an arithmetic number, because the mean of its divisors is an integer number (4311840).

Almost surely, 2^28712765 is an apocalyptic number.

It is an amenable number.

28712765 is a deficient number, since it is larger than the sum of its proper divisors (5781955).

28712765 is a wasteful number, since it uses less digits than its factorization.

28712765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6571.

The product of its digits is 47040, while the sum is 38.

The square root of 28712765 is about 5358.4293407677. The cubic root of 28712765 is about 306.2139738269.

The spelling of 28712765 in words is "twenty-eight million, seven hundred twelve thousand, seven hundred sixty-five".