28404685 has 8 divisors (see below), whose sum is σ = 34811136. Its totient is φ = 22240080.

The previous prime is 28404683. The next prime is 28404689. The reversal of 28404685 is 58640482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28404685 - 2¹ = 28404683 is a prime.

It is a super-2 number, since 2×28404685² = 1613652259898450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404683) 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, 60201 + ... + 60670.

It is an arithmetic number, because the mean of its divisors is an integer number (4351392).

Almost surely, 2^28404685 is an apocalyptic number.

It is an amenable number.

28404685 is a deficient number, since it is larger than the sum of its proper divisors (6406451).

28404685 is a wasteful number, since it uses less digits than its factorization.

28404685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120923.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 28404685 is about 5329.6045819554. The cubic root of 28404685 is about 305.1148362700.

It can be divided in two parts, 28 and 404685, that multiplied together give a triangular number (11331180 = T₄₇₆₀).

The spelling of 28404685 in words is "twenty-eight million, four hundred four thousand, six hundred eighty-five".