28613765 has 8 divisors (see below), whose sum is σ = 35264760. Its totient is φ = 22272192.

The previous prime is 28613759. The next prime is 28613773. The reversal of 28613765 is 56731682.

It can be written as a sum of positive squares in 4 ways, for example, as 13667809 + 14945956 = 3697^2 + 3866^2 .

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 28613765 - 2¹⁴ = 28597381 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, 77150 + ... + 77519.

It is an arithmetic number, because the mean of its divisors is an integer number (4408095).

Almost surely, 2^28613765 is an apocalyptic number.

It is an amenable number.

28613765 is a deficient number, since it is larger than the sum of its proper divisors (6650995).

28613765 is a wasteful number, since it uses less digits than its factorization.

28613765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154711.

The product of its digits is 60480, while the sum is 38.

The square root of 28613765 is about 5349.1835825666. The cubic root of 28613765 is about 305.8616323743.

The spelling of 28613765 in words is "twenty-eight million, six hundred thirteen thousand, seven hundred sixty-five".