231648278 has 16 divisors (see below), whose sum is σ = 361987920. Its totient is φ = 111081600.

The previous prime is 231648271. The next prime is 231648301. The reversal of 231648278 is 872846132.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231648271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19103 + ... + 28778.

It is an arithmetic number, because the mean of its divisors is an integer number (22624245).

Almost surely, 2^231648278 is an apocalyptic number.

231648278 is a deficient number, since it is larger than the sum of its proper divisors (130339642).

231648278 is a wasteful number, since it uses less digits than its factorization.

231648278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47983.

The product of its digits is 129024, while the sum is 41.

The square root of 231648278 is about 15219.9959921151. The cubic root of 231648278 is about 614.1526904365.

The spelling of 231648278 in words is "two hundred thirty-one million, six hundred forty-eight thousand, two hundred seventy-eight".