721724070 has 16 divisors (see below), whose sum is σ = 1732137840. Its totient is φ = 192459744.

The previous prime is 721724039. The next prime is 721724077. The reversal of 721724070 is 70427127.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 24057469 = 721724070 / (7 + 2 + 1 + 7 + 2 + 4 + 0 + 7 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721724077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12028705 + ... + 12028764.

It is an arithmetic number, because the mean of its divisors is an integer number (108258615).

Almost surely, 2^721724070 is an apocalyptic number.

721724070 is an abundant number, since it is smaller than the sum of its proper divisors (1010413770).

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

721724070 is a wasteful number, since it uses less digits than its factorization.

721724070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24057479.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 721724070 is about 26864.9226687888. The cubic root of 721724070 is about 896.9957730823.

The spelling of 721724070 in words is "seven hundred twenty-one million, seven hundred twenty-four thousand, seventy".