28720486 has 8 divisors (see below), whose sum is σ = 43107264. Its totient is φ = 14351400.

The previous prime is 28720453. The next prime is 28720487. The reversal of 28720486 is 68402782.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936 + ... + 7636.

It is an arithmetic number, because the mean of its divisors is an integer number (5388408).

Almost surely, 2^28720486 is an apocalyptic number.

28720486 is a deficient number, since it is larger than the sum of its proper divisors (14386778).

28720486 is a wasteful number, since it uses less digits than its factorization.

28720486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8846.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28720486 is about 5359.1497459952. The cubic root of 28720486 is about 306.2414188349.

The spelling of 28720486 in words is "twenty-eight million, seven hundred twenty thousand, four hundred eighty-six".