721727370 has 144 divisors (see below), whose sum is σ = 2350955880. Its totient is φ = 152264448.

The previous prime is 721727329. The next prime is 721727389. The reversal of 721727370 is 73727127.

721727370 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 274531761 + 447195609 = 16569^2 + 21147^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 51036 + ... + 63624.

Almost surely, 2^721727370 is an apocalyptic number.

721727370 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 721727370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175477940).

721727370 is an abundant number, since it is smaller than the sum of its proper divisors (1629228510).

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

721727370 is a wasteful number, since it uses less digits than its factorization.

721727370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12629 (or 12619 counting only the distinct ones).

The product of its (nonzero) digits is 28812, while the sum is 36.

The square root of 721727370 is about 26864.9840870975. The cubic root of 721727370 is about 896.9971402168.

The spelling of 721727370 in words is "seven hundred twenty-one million, seven hundred twenty-seven thousand, three hundred seventy".