28180746 has 24 divisors (see below), whose sum is σ = 66609504. Its totient is φ = 8539560.

The previous prime is 28180699. The next prime is 28180753. The reversal of 28180746 is 64708182.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28180746.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70966 + ... + 71361.

It is an arithmetic number, because the mean of its divisors is an integer number (2775396).

Almost surely, 2^28180746 is an apocalyptic number.

28180746 is an abundant number, since it is smaller than the sum of its proper divisors (38428758).

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

28180746 is a wasteful number, since it uses less digits than its factorization.

28180746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142346 (or 142343 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28180746 is about 5308.5540404144. The cubic root of 28180746 is about 304.3108906914.

The spelling of 28180746 in words is "twenty-eight million, one hundred eighty thousand, seven hundred forty-six".