721463987812 has 12 divisors (see below), whose sum is σ = 1274145116860. Its totient is φ = 357422525856.

The previous prime is 721463987809. The next prime is 721463987813. The reversal of 721463987812 is 218789364127.

It can be written as a sum of positive squares in 2 ways, for example, as 546425510436 + 175038477376 = 739206^2 + 418376^2 .

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (721463987813) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 827366523 + ... + 827367394.

Almost surely, 2^721463987812 is an apocalyptic number.

It is an amenable number.

721463987812 is a deficient number, since it is larger than the sum of its proper divisors (552681129048).

721463987812 is a wasteful number, since it uses less digits than its factorization.

721463987812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654734030 (or 1654734028 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The spelling of 721463987812 in words is "seven hundred twenty-one billion, four hundred sixty-three million, nine hundred eighty-seven thousand, eight hundred twelve".