731781120 has 384 divisors, whose sum is σ = 2773854720. Its totient is φ = 161218560.

The previous prime is 731781097. The next prime is 731781121. The reversal of 731781120 is 21187137.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731781121) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 8816599 + ... + 8816681.

It is an arithmetic number, because the mean of its divisors is an integer number (7223580).

Almost surely, 2^731781120 is an apocalyptic number.

731781120 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731781120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386927360).

731781120 is an abundant number, since it is smaller than the sum of its proper divisors (2042073600).

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

731781120 is a wasteful number, since it uses less digits than its factorization.

731781120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 731781120 is about 27051.4531957158. The cubic root of 731781120 is about 901.1430414972.

The spelling of 731781120 in words is "seven hundred thirty-one million, seven hundred eighty-one thousand, one hundred twenty".