28086738 has 16 divisors (see below), whose sum is σ = 56753760. Its totient is φ = 9265536.

The previous prime is 28086733. The next prime is 28086743. The reversal of 28086738 is 83768082.

It is an interprime number because it is at equal distance from previous prime (28086733) and next prime (28086743).

It is a self number, because there is not a number n which added to its sum of digits gives 28086738.

It is not an unprimeable number, because it can be changed into a prime (28086733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23548 + ... + 24711.

It is an arithmetic number, because the mean of its divisors is an integer number (3547110).

Almost surely, 2^28086738 is an apocalyptic number.

28086738 is an abundant number, since it is smaller than the sum of its proper divisors (28667022).

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

28086738 is a wasteful number, since it uses less digits than its factorization.

28086738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48361.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28086738 is about 5299.6922552163. The cubic root of 28086738 is about 303.9721306977.

The spelling of 28086738 in words is "twenty-eight million, eighty-six thousand, seven hundred thirty-eight".