28687766 has 16 divisors (see below), whose sum is σ = 44388864. Its totient is φ = 13897704.

The previous prime is 28687753. The next prime is 28687781. The reversal of 28687766 is 66778682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8201 + ... + 11163.

It is an arithmetic number, because the mean of its divisors is an integer number (2774304).

Almost surely, 2^28687766 is an apocalyptic number.

28687766 is a deficient number, since it is larger than the sum of its proper divisors (15701098).

28687766 is a wasteful number, since it uses less digits than its factorization.

28687766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115.

The product of its digits is 1354752, while the sum is 50.

The square root of 28687766 is about 5356.0961529831. The cubic root of 28687766 is about 306.1250788023.

The spelling of 28687766 in words is "twenty-eight million, six hundred eighty-seven thousand, seven hundred sixty-six".