722436 has 48 divisors (see below), whose sum is σ = 1985088. Its totient is φ = 201600.

The previous prime is 722431. The next prime is 722459. The reversal of 722436 is 634227.

It is a d-powerful number, because it can be written as 7⁶ + 2 + 4⁸ + 2⁵ + 3¹² + 6⁵ .

It is not an unprimeable number, because it can be changed into a prime (722431) by changing a digit.

722436 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1506 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (41356).

2⁷²²⁴³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992544).

722436 is an abundant number, since it is smaller than the sum of its proper divisors (1262652).

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

722436 is a wasteful number, since it uses less digits than its factorization.

722436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 450 counting only the distinct ones).

The product of its digits is 2016, while the sum is 24.

The square root of 722436 is about 849.9623521074. The cubic root of 722436 is about 89.7290617222.

Subtracting from 722436 its reverse (634227), we obtain a square (88209 = 297²).

It can be divided in two parts, 7224 and 36, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 722436 in words is "seven hundred twenty-two thousand, four hundred thirty-six".