231328778 has 8 divisors (see below), whose sum is σ = 347312772. Its totient is φ = 115557856.

The previous prime is 231328771. The next prime is 231328807. The reversal of 231328778 is 877823132.

It can be written as a sum of positive squares in 2 ways, for example, as 195244729 + 36084049 = 13973^2 + 6007^2 .

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

It is not an unprimeable number, because it can be changed into a prime (231328771) 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, 50525 + ... + 54912.

Almost surely, 2^231328778 is an apocalyptic number.

231328778 is a deficient number, since it is larger than the sum of its proper divisors (115983994).

231328778 is a wasteful number, since it uses less digits than its factorization.

231328778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106536.

The product of its digits is 112896, while the sum is 41.

The square root of 231328778 is about 15209.4963098717. The cubic root of 231328778 is about 613.8702046090.

The spelling of 231328778 in words is "two hundred thirty-one million, three hundred twenty-eight thousand, seven hundred seventy-eight".