28386040 has 16 divisors (see below), whose sum is σ = 63868680. Its totient is φ = 11354400.

The previous prime is 28386031. The next prime is 28386047. The reversal of 28386040 is 4068382.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28385993 and 28386011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28386047) 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, 354786 + ... + 354865.

Almost surely, 2^28386040 is an apocalyptic number.

28386040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28386040 is an abundant number, since it is smaller than the sum of its proper divisors (35482640).

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

28386040 is a wasteful number, since it uses less digits than its factorization.

28386040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709662 (or 709658 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28386040 is about 5327.8551031348. The cubic root of 28386040 is about 305.0480619414.

The spelling of 28386040 in words is "twenty-eight million, three hundred eighty-six thousand, forty".