28690668 has 36 divisors (see below), whose sum is σ = 72687888. Its totient is φ = 9541920.

The previous prime is 28690661. The next prime is 28690681. The reversal of 28690668 is 86609682.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28690661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27313 + ... + 28343.

It is an arithmetic number, because the mean of its divisors is an integer number (2019108).

Almost surely, 2^28690668 is an apocalyptic number.

It is an amenable number.

28690668 is an abundant number, since it is smaller than the sum of its proper divisors (43997220).

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

28690668 is a wasteful number, since it uses less digits than its factorization.

28690668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814 (or 1809 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 28690668 is about 5356.3670523966. The cubic root of 28690668 is about 306.1354007984.

The spelling of 28690668 in words is "twenty-eight million, six hundred ninety thousand, six hundred sixty-eight".