231028778 has 8 divisors (see below), whose sum is σ = 352416960. Its totient is φ = 113556460.

The previous prime is 231028769. The next prime is 231028789. The reversal of 231028778 is 877820132.

231028778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 978818 + ... + 979053.

It is an arithmetic number, because the mean of its divisors is an integer number (44052120).

Almost surely, 2^231028778 is an apocalyptic number.

231028778 is a deficient number, since it is larger than the sum of its proper divisors (121388182).

231028778 is a wasteful number, since it uses less digits than its factorization.

231028778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957932.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 231028778 is about 15199.6308507806. The cubic root of 231028778 is about 613.6047228266.

The spelling of 231028778 in words is "two hundred thirty-one million, twenty-eight thousand, seven hundred seventy-eight".