28649418 has 32 divisors (see below), whose sum is σ = 66825600. Its totient is φ = 8184960.

The previous prime is 28649407. The next prime is 28649459. The reversal of 28649418 is 81494682.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28649418.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4903 + ... + 9018.

It is an arithmetic number, because the mean of its divisors is an integer number (2088300).

Almost surely, 2^28649418 is an apocalyptic number.

28649418 is an abundant number, since it is smaller than the sum of its proper divisors (38176182).

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

28649418 is a wasteful number, since it uses less digits than its factorization.

28649418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13947 (or 13933 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 28649418 is about 5352.5151097405. The cubic root of 28649418 is about 305.9886150662.

The spelling of 28649418 in words is "twenty-eight million, six hundred forty-nine thousand, four hundred eighteen".