28129765 has 8 divisors (see below), whose sum is σ = 34071840. Its totient is φ = 22293072.

The previous prime is 28129763. The next prime is 28129769. The reversal of 28129765 is 56792182.

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 28129765 - 2¹ = 28129763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28129763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25755 + ... + 26824.

It is an arithmetic number, because the mean of its divisors is an integer number (4258980).

Almost surely, 2^28129765 is an apocalyptic number.

It is an amenable number.

28129765 is a deficient number, since it is larger than the sum of its proper divisors (5942075).

28129765 is a wasteful number, since it uses less digits than its factorization.

28129765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52691.

The product of its digits is 60480, while the sum is 40.

The square root of 28129765 is about 5303.7500883809. The cubic root of 28129765 is about 304.1272731452.

The spelling of 28129765 in words is "twenty-eight million, one hundred twenty-nine thousand, seven hundred sixty-five".