28726340 has 24 divisors (see below), whose sum is σ = 60426240. Its totient is φ = 11471328.

The previous prime is 28726339. The next prime is 28726361. The reversal of 28726340 is 4362782.

It is a junction number, because it is equal to n+sod(n) for n = 28726297 and 28726306.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21821 + ... + 23099.

It is an arithmetic number, because the mean of its divisors is an integer number (2517760).

Almost surely, 2^28726340 is an apocalyptic number.

28726340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28726340 is an abundant number, since it is smaller than the sum of its proper divisors (31699900).

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

28726340 is a wasteful number, since it uses less digits than its factorization.

28726340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411 (or 2409 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 28726340 is about 5359.6958868951. The cubic root of 28726340 is about 306.2622241407.

The spelling of 28726340 in words is "twenty-eight million, seven hundred twenty-six thousand, three hundred forty".