28389740 has 12 divisors (see below), whose sum is σ = 59618496. Its totient is φ = 11355888.

The previous prime is 28389737. The next prime is 28389749. The reversal of 28389740 is 4798382.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28389749) 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, 709724 + ... + 709763.

It is an arithmetic number, because the mean of its divisors is an integer number (4968208).

Almost surely, 2^28389740 is an apocalyptic number.

28389740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28389740 is an abundant number, since it is smaller than the sum of its proper divisors (31228756).

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

28389740 is a wasteful number, since it uses less digits than its factorization.

28389740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419496 (or 1419494 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28389740 is about 5328.2023234858. The cubic root of 28389740 is about 305.0613152728.

The spelling of 28389740 in words is "twenty-eight million, three hundred eighty-nine thousand, seven hundred forty".