28727690 has 64 divisors (see below), whose sum is σ = 57542400. Its totient is φ = 10289664.

The previous prime is 28727689. The next prime is 28727701. The reversal of 28727690 is 9672782.

It is a super-2 number, since 2×28727690² = 1650560345472200, which contains 22 as substring.

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, 393494 + ... + 393566.

It is an arithmetic number, because the mean of its divisors is an integer number (899100).

Almost surely, 2^28727690 is an apocalyptic number.

28727690 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

28727690 is a wasteful number, since it uses less digits than its factorization.

28727690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 28727690 is about 5359.8218253968. The cubic root of 28727690 is about 306.2670216834.

The spelling of 28727690 in words is "twenty-eight million, seven hundred twenty-seven thousand, six hundred ninety".