722250 has 64 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 190800.

The previous prime is 722243. The next prime is 722257. The reversal of 722250 is 52227.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (722243) and next prime (722257).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (722257) by changing a digit.

722250 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 31 ways as a sum of consecutive naturals, for example, 6697 + ... + 6803.

It is an arithmetic number, because the mean of its divisors is an integer number (31590).

2⁷²²²⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010880).

722250 is an abundant number, since it is smaller than the sum of its proper divisors (1299510).

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

722250 is a wasteful number, since it uses less digits than its factorization.

722250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 722250 is about 849.8529284529. The cubic root of 722250 is about 89.7213604458.

Adding to 722250 its reverse (52227), we get a palindrome (774477).

The spelling of 722250 in words is "seven hundred twenty-two thousand, two hundred fifty".