721899533800 has 24 divisors (see below), whose sum is σ = 1678416416550. Its totient is φ = 288759813440.

The previous prime is 721899533791. The next prime is 721899533809. The reversal of 721899533800 is 8335998127.

It is an interprime number because it is at equal distance from previous prime (721899533791) and next prime (721899533809).

It can be written as a sum of positive squares in 3 ways, for example, as 631188936676 + 90710597124 = 794474^2 + 301182^2 .

It is a super-2 number, since 2×721899533800² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721899533809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1804748635 + ... + 1804749034.

Almost surely, 2^721899533800 is an apocalyptic number.

It is an amenable number.

721899533800 is an abundant number, since it is smaller than the sum of its proper divisors (956516882750).

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

721899533800 is a wasteful number, since it uses less digits than its factorization.

721899533800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609497685 (or 3609497676 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 721899533800 in words is "seven hundred twenty-one billion, eight hundred ninety-nine million, five hundred thirty-three thousand, eight hundred".