721671340 has 48 divisors (see below), whose sum is σ = 1671919200. Its totient is φ = 259960320.

The previous prime is 721671329. The next prime is 721671341. The reversal of 721671340 is 43176127.

It is not an unprimeable number, because it can be changed into a prime (721671341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23190 + ... + 44509.

It is an arithmetic number, because the mean of its divisors is an integer number (34831650).

Almost surely, 2^721671340 is an apocalyptic number.

It is an amenable number.

721671340 is an abundant number, since it is smaller than the sum of its proper divisors (950247860).

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

721671340 is a wasteful number, since it uses less digits than its factorization.

721671340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67762 (or 67760 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 721671340 is about 26863.9412596142. The cubic root of 721671340 is about 896.9739273654.

The spelling of 721671340 in words is "seven hundred twenty-one million, six hundred seventy-one thousand, three hundred forty".