1231744728 has 32 divisors (see below), whose sum is σ = 3094848000. Its totient is φ = 408516768.

The previous prime is 1231744727. The next prime is 1231744769. The reversal of 1231744728 is 8274471321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231744727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124176 + ... + 133727.

It is an arithmetic number, because the mean of its divisors is an integer number (96714000).

Almost surely, 2^1231744728 is an apocalyptic number.

It is an amenable number.

1231744728 is an abundant number, since it is smaller than the sum of its proper divisors (1863103272).

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

1231744728 is a wasteful number, since it uses less digits than its factorization.

1231744728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258111 (or 258107 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 1231744728 is about 35096.2209931497. The cubic root of 1231744728 is about 1071.9476356504.

The spelling of 1231744728 in words is "one billion, two hundred thirty-one million, seven hundred forty-four thousand, seven hundred twenty-eight".