28648686 has 24 divisors (see below), whose sum is σ = 62981352. Its totient is φ = 8681200.

The previous prime is 28648657. The next prime is 28648699. The reversal of 28648686 is 68684682.

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 11 ways as a sum of consecutive naturals, for example, 19005 + ... + 20456.

It is an arithmetic number, because the mean of its divisors is an integer number (2624223).

Almost surely, 2^28648686 is an apocalyptic number.

28648686 is an abundant number, since it is smaller than the sum of its proper divisors (34332666).

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

28648686 is a wasteful number, since it uses less digits than its factorization.

28648686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39488 (or 39477 counting only the distinct ones).

The product of its digits is 884736, while the sum is 48.

The square root of 28648686 is about 5352.4467302347. The cubic root of 28648686 is about 305.9860090147.

The spelling of 28648686 in words is "twenty-eight million, six hundred forty-eight thousand, six hundred eighty-six".