721953460 has 12 divisors (see below), whose sum is σ = 1516102308. Its totient is φ = 288781376.

The previous prime is 721953413. The next prime is 721953481. The reversal of 721953460 is 64359127.

It can be written as a sum of positive squares in 2 ways, for example, as 398960676 + 322992784 = 19974^2 + 17972^2 .

It is a congruent number.

It is an unprimeable number.

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, 18048817 + ... + 18048856.

It is an arithmetic number, because the mean of its divisors is an integer number (126341859).

Almost surely, 2^721953460 is an apocalyptic number.

It is an amenable number.

721953460 is an abundant number, since it is smaller than the sum of its proper divisors (794148848).

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

721953460 is a wasteful number, since it uses less digits than its factorization.

721953460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36097682 (or 36097680 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 721953460 is about 26869.1916514063. The cubic root of 721953460 is about 897.0907955769.

It can be divided in two parts, 721 and 953460, that multiplied together give a triangular number (687444660 = T₃₇₀₇₉).

The spelling of 721953460 in words is "seven hundred twenty-one million, nine hundred fifty-three thousand, four hundred sixty".