28729645 has 32 divisors (see below), whose sum is σ = 41679360. Its totient is φ = 18585600.

The previous prime is 28729639. The next prime is 28729651. The reversal of 28729645 is 54692782.

It is an interprime number because it is at equal distance from previous prime (28729639) and next prime (28729651).

It is not a de Polignac number, because 28729645 - 2¹³ = 28721453 is a prime.

It is a super-3 number, since 3×28729645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71445 + ... + 71845.

It is an arithmetic number, because the mean of its divisors is an integer number (1302480).

Almost surely, 2^28729645 is an apocalyptic number.

It is an amenable number.

28729645 is a deficient number, since it is larger than the sum of its proper divisors (12949715).

28729645 is a wasteful number, since it uses less digits than its factorization.

28729645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its digits is 241920, while the sum is 43.

The square root of 28729645 is about 5360.0041977596. The cubic root of 28729645 is about 306.2739689695.

The spelling of 28729645 in words is "twenty-eight million, seven hundred twenty-nine thousand, six hundred forty-five".