721451652 has 12 divisors (see below), whose sum is σ = 1683387216. Its totient is φ = 240483880.

The previous prime is 721451651. The next prime is 721451677. The reversal of 721451652 is 256154127.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (721451651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30060474 + ... + 30060497.

It is an arithmetic number, because the mean of its divisors is an integer number (140282268).

Almost surely, 2^721451652 is an apocalyptic number.

It is an amenable number.

721451652 is an abundant number, since it is smaller than the sum of its proper divisors (961935564).

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

721451652 is a wasteful number, since it uses less digits than its factorization.

721451652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60120978 (or 60120976 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 721451652 is about 26859.8520472470. The cubic root of 721451652 is about 896.8829005152.

The spelling of 721451652 in words is "seven hundred twenty-one million, four hundred fifty-one thousand, six hundred fifty-two".