721675872 has 96 divisors (see below), whose sum is σ = 2139550560. Its totient is φ = 236597760.

The previous prime is 721675847. The next prime is 721675897. The reversal of 721675872 is 278576127.

721675872 is a `hidden beast` number, since 7 + 2 + 1 + 67 + 587 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (721675847) and next prime (721675897).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45858 + ... + 59550.

It is an arithmetic number, because the mean of its divisors is an integer number (22286985).

Almost surely, 2^721675872 is an apocalyptic number.

721675872 is a gapful number since it is divisible by the number (72) 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 721675872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1069775280).

721675872 is an abundant number, since it is smaller than the sum of its proper divisors (1417874688).

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

721675872 is a wasteful number, since it uses less digits than its factorization.

721675872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13773 (or 13759 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 721675872 is about 26864.0256104702. The cubic root of 721675872 is about 896.9758049871.

The spelling of 721675872 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, eight hundred seventy-two".