722457 has 6 divisors (see below), whose sum is σ = 1043562. Its totient is φ = 481632.

The previous prime is 722431. The next prime is 722459. The reversal of 722457 is 754227.

It can be written as a sum of positive squares in only one way, i.e., 553536 + 168921 = 744^2 + 411^2 .

It is a de Polignac number, because none of the positive numbers 2^k-722457 is a prime.

It is a d-powerful number, because it can be written as 7 + 2¹⁶ + 4⁶ + 2¹⁸ + 5⁸ + 7² .

722457 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 722457.

It is not an unprimeable number, because it can be changed into a prime (722459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40128 + ... + 40145.

It is an arithmetic number, because the mean of its divisors is an integer number (173927).

2⁷²²⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

722457 is a deficient number, since it is larger than the sum of its proper divisors (321105).

722457 is a wasteful number, since it uses less digits than its factorization.

722457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80279 (or 80276 counting only the distinct ones).

The product of its digits is 3920, while the sum is 27.

The square root of 722457 is about 849.9747055060. The cubic root of 722457 is about 89.7299311381.

The spelling of 722457 in words is "seven hundred twenty-two thousand, four hundred fifty-seven".