28729386 has 36 divisors (see below), whose sum is σ = 72412002. Its totient is φ = 8208144.

The previous prime is 28729319. The next prime is 28729403. The reversal of 28729386 is 68392782.

28729386 is a `hidden beast` number, since 287 + 293 + 86 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28676025 + 53361 = 5355^2 + 231^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15405 + ... + 17168.

Almost surely, 2^28729386 is an apocalyptic number.

28729386 is an abundant number, since it is smaller than the sum of its proper divisors (43682616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28729386 is a wasteful number, since it uses less digits than its factorization.

28729386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32595 (or 32585 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28729386 is about 5359.9800372763. The cubic root of 28729386 is about 306.2730486054.

The spelling of 28729386 in words is "twenty-eight million, seven hundred twenty-nine thousand, three hundred eighty-six".