28256723390 has 32 divisors (see below), whose sum is σ = 58208177664. Its totient is φ = 9674676000.

The previous prime is 28256723377. The next prime is 28256723401. The reversal of 28256723390 is 9332765282.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226736 + ... + 328515.

It is an arithmetic number, because the mean of its divisors is an integer number (1819005552).

Almost surely, 2^28256723390 is an apocalyptic number.

28256723390 is an abundant number, since it is smaller than the sum of its proper divisors (29951454274).

28256723390 is a wasteful number, since it uses less digits than its factorization.

28256723390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555992.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 28256723390 in words is "twenty-eight billion, two hundred fifty-six million, seven hundred twenty-three thousand, three hundred ninety".