28190380 has 12 divisors (see below), whose sum is σ = 59199840. Its totient is φ = 11276144.

The previous prime is 28190363. The next prime is 28190381. The reversal of 28190380 is 8309182.

It is not an unprimeable number, because it can be changed into a prime (28190381) 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 3 ways as a sum of consecutive naturals, for example, 704740 + ... + 704779.

It is an arithmetic number, because the mean of its divisors is an integer number (4933320).

Almost surely, 2^28190380 is an apocalyptic number.

28190380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28190380 is an abundant number, since it is smaller than the sum of its proper divisors (31009460).

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

28190380 is a wasteful number, since it uses less digits than its factorization.

28190380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409528 (or 1409526 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 28190380 is about 5309.4613662781. The cubic root of 28190380 is about 304.3455644493.

The spelling of 28190380 in words is "twenty-eight million, one hundred ninety thousand, three hundred eighty".