722631 has 16 divisors (see below), whose sum is σ = 1186304. Its totient is φ = 381024.

The previous prime is 722611. The next prime is 722633. The reversal of 722631 is 136227.

It is a happy number.

722631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 722631 - 2⁵ = 722599 is a prime.

It is a super-2 number, since 2×722631² = 1044391124322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 722598 and 722607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1051 + ... + 1596.

It is an arithmetic number, because the mean of its divisors is an integer number (74144).

2⁷²²⁶³¹ is an apocalyptic number.

722631 is a deficient number, since it is larger than the sum of its proper divisors (463673).

722631 is a wasteful number, since it uses less digits than its factorization.

722631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670.

The product of its digits is 504, while the sum is 21.

The square root of 722631 is about 850.0770553309. The cubic root of 722631 is about 89.7371342218.

Adding to 722631 its reverse (136227), we get a palindrome (858858).

The spelling of 722631 in words is "seven hundred twenty-two thousand, six hundred thirty-one".