731144736 has 144 divisors (see below), whose sum is σ = 2412131904. Its totient is φ = 205742592.

The previous prime is 731144707. The next prime is 731144749. The reversal of 731144736 is 637441137.

731144736 is a `hidden beast` number, since 73 + 114 + 473 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 731144736.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132366 + ... + 137778.

It is an arithmetic number, because the mean of its divisors is an integer number (16750916).

Almost surely, 2^731144736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731144736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1206065952).

731144736 is an abundant number, since it is smaller than the sum of its proper divisors (1680987168).

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

731144736 is a wasteful number, since it uses less digits than its factorization.

731144736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5503 (or 5492 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 731144736 is about 27039.6881638824. The cubic root of 731144736 is about 900.8817432684.

The spelling of 731144736 in words is "seven hundred thirty-one million, one hundred forty-four thousand, seven hundred thirty-six".