722173507 has 4 divisors (see below), whose sum is σ = 787825656. Its totient is φ = 656521360.

The previous prime is 722173493. The next prime is 722173513. The reversal of 722173507 is 705371227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705371227 = 11 ⋅64124657.

It is a de Polignac number, because none of the positive numbers 2^k-722173507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722173547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32826058 + ... + 32826079.

It is an arithmetic number, because the mean of its divisors is an integer number (196956414).

Almost surely, 2^722173507 is an apocalyptic number.

722173507 is a deficient number, since it is larger than the sum of its proper divisors (65652149).

722173507 is a wasteful number, since it uses less digits than its factorization.

722173507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65652148.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 722173507 is about 26873.2861220953. The cubic root of 722173507 is about 897.1819289149.

The spelling of 722173507 in words is "seven hundred twenty-two million, one hundred seventy-three thousand, five hundred seven".