722557 has 4 divisors (see below), whose sum is σ = 788256. Its totient is φ = 656860.

The previous prime is 722539. The next prime is 722563. The reversal of 722557 is 755227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 722557 - 2¹⁵ = 689789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32833 + ... + 32854.

It is an arithmetic number, because the mean of its divisors is an integer number (197064).

2⁷²²⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

722557 is a deficient number, since it is larger than the sum of its proper divisors (65699).

722557 is a wasteful number, since it uses less digits than its factorization.

722557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65698.

The product of its digits is 4900, while the sum is 28.

The square root of 722557 is about 850.0335287505. The cubic root of 722557 is about 89.7340709827.

The spelling of 722557 in words is "seven hundred twenty-two thousand, five hundred fifty-seven".