731030272128 has 640 divisors, whose sum is σ = 2396915136000. Its totient is φ = 221112612864.

The previous prime is 731030272127. The next prime is 731030272157. The reversal of 731030272128 is 821272030137.

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

It is a junction number, because it is equal to n+sod(n) for n = 731030272092 and 731030272101.

It is not an unprimeable number, because it can be changed into a prime (731030272123) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1526158993 + ... + 1526159471.

It is an arithmetic number, because the mean of its divisors is an integer number (3745179900).

Almost surely, 2^731030272128 is an apocalyptic number.

731030272128 is a gapful number since it is divisible by the number (78) 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 731030272128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198457568000).

731030272128 is an abundant number, since it is smaller than the sum of its proper divisors (1665884863872).

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

731030272128 is an equidigital number, since it uses as much as digits as its factorization.

731030272128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 731030272128 in words is "seven hundred thirty-one billion, thirty million, two hundred seventy-two thousand, one hundred twenty-eight".