28390739 has 8 divisors (see below), whose sum is σ = 31629360. Its totient is φ = 25302816.

The previous prime is 28390727. The next prime is 28390759. The reversal of 28390739 is 93709382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28390739 - 2¹² = 28386643 is a prime.

It is a super-2 number, since 2×28390739² = 1612068121932242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28390696 and 28390705.

It is not an unprimeable number, because it can be changed into a prime (28390759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37277 + ... + 38030.

It is an arithmetic number, because the mean of its divisors is an integer number (3953670).

Almost surely, 2^28390739 is an apocalyptic number.

28390739 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28390739 is a deficient number, since it is larger than the sum of its proper divisors (3238621).

28390739 is a wasteful number, since it uses less digits than its factorization.

28390739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75349.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 28390739 is about 5328.2960691013. The cubic root of 28390739 is about 305.0648934749.

The spelling of 28390739 in words is "twenty-eight million, three hundred ninety thousand, seven hundred thirty-nine".