28387786 has 16 divisors (see below), whose sum is σ = 51226560. Its totient is φ = 11525760.

The previous prime is 28387771. The next prime is 28387787. The reversal of 28387786 is 68778382.

It is not an unprimeable number, because it can be changed into a prime (28387787) 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, 53095 + ... + 53626.

It is an arithmetic number, because the mean of its divisors is an integer number (3201660).

Almost surely, 2^28387786 is an apocalyptic number.

28387786 is a deficient number, since it is larger than the sum of its proper divisors (22838774).

28387786 is a wasteful number, since it uses less digits than its factorization.

28387786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106749.

The product of its digits is 903168, while the sum is 49.

The square root of 28387786 is about 5328.0189564227. The cubic root of 28387786 is about 305.0543162245.

The spelling of 28387786 in words is "twenty-eight million, three hundred eighty-seven thousand, seven hundred eighty-six".