28972668 has 12 divisors (see below), whose sum is σ = 67602920. Its totient is φ = 9657552.

The previous prime is 28972667. The next prime is 28972673. The reversal of 28972668 is 86627982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28972667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207183 + ... + 1207206.

Almost surely, 2^28972668 is an apocalyptic number.

It is an amenable number.

28972668 is an abundant number, since it is smaller than the sum of its proper divisors (38630252).

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

28972668 is a wasteful number, since it uses less digits than its factorization.

28972668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414396 (or 2414394 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 28972668 is about 5382.6264964235. The cubic root of 28972668 is about 307.1351320419.

It can be divided in two parts, 2897 and 2668, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 28972668 in words is "twenty-eight million, nine hundred seventy-two thousand, six hundred sixty-eight".