28772605 has 8 divisors (see below), whose sum is σ = 34747992. Its totient is φ = 22870848.

The previous prime is 28772581. The next prime is 28772617. The reversal of 28772605 is 50627782.

It can be written as a sum of positive squares in 4 ways, for example, as 777924 + 27994681 = 882^2 + 5291^2 .

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 28772605 - 2¹³ = 28764413 is a prime.

It is a Duffinian number.

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, 17542 + ... + 19111.

It is an arithmetic number, because the mean of its divisors is an integer number (4343499).

Almost surely, 2^28772605 is an apocalyptic number.

It is an amenable number.

28772605 is a deficient number, since it is larger than the sum of its proper divisors (5975387).

28772605 is a wasteful number, since it uses less digits than its factorization.

28772605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36815.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 28772605 is about 5364.0101603185. The cubic root of 28772605 is about 306.4265520930.

The spelling of 28772605 in words is "twenty-eight million, seven hundred seventy-two thousand, six hundred five".