721652140 has 48 divisors (see below), whose sum is σ = 1725131520. Its totient is φ = 251007680.

The previous prime is 721652119. The next prime is 721652189. The reversal of 721652140 is 41256127.

It is a super-2 number, since 2×721652140² = 1041563622333159200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721652099 and 721652108.

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, 66250 + ... + 76369.

It is an arithmetic number, because the mean of its divisors is an integer number (35940240).

Almost surely, 2^721652140 is an apocalyptic number.

It is an amenable number.

721652140 is an abundant number, since it is smaller than the sum of its proper divisors (1003479380).

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

721652140 is a wasteful number, since it uses less digits than its factorization.

721652140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142662 (or 142660 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 721652140 is about 26863.5839008871. The cubic root of 721652140 is about 896.9659726585.

It can be divided in two parts, 72165 and 2140, that added together give a triangular number (74305 = T₃₈₅).

The spelling of 721652140 in words is "seven hundred twenty-one million, six hundred fifty-two thousand, one hundred forty".