721745340 has 24 divisors (see below), whose sum is σ = 2020887120. Its totient is φ = 192465408.

The previous prime is 721745329. The next prime is 721745389. The reversal of 721745340 is 43547127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6014485 + ... + 6014604.

It is an arithmetic number, because the mean of its divisors is an integer number (84203630).

Almost surely, 2^721745340 is an apocalyptic number.

It is an amenable number.

721745340 is an abundant number, since it is smaller than the sum of its proper divisors (1299141780).

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

721745340 is a wasteful number, since it uses less digits than its factorization.

721745340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12029101 (or 12029099 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 721745340 is about 26865.3185352417. The cubic root of 721745340 is about 897.0045848122.

The spelling of 721745340 in words is "seven hundred twenty-one million, seven hundred forty-five thousand, three hundred forty".