721504143396 has 81 divisors (see below), whose sum is σ = 1925102178363. Its totient is φ = 227812834800.

The previous prime is 721504143379. The next prime is 721504143407. The reversal of 721504143396 is 693341405127.

The square root of 721504143396 is 849414.

It is a perfect power (a square), and thus also a powerful number.

721504143396 is a `hidden beast` number, since 7 + 21 + 504 + 1 + 4 + 33 + 96 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 96829471 + ... + 96836921.

Almost surely, 2^721504143396 is an apocalyptic number.

721504143396 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

721504143396 is the 849414-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721504143396

721504143396 is an abundant number, since it is smaller than the sum of its proper divisors (1203598034967).

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

721504143396 is an equidigital number, since it uses as much as digits as its factorization.

721504143396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14950 (or 7475 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

It can be divided in two parts, 721504 and 143396, that added together give a square (864900 = 930²).

The spelling of 721504143396 in words is "seven hundred twenty-one billion, five hundred four million, one hundred forty-three thousand, three hundred ninety-six".