722167740 has 144 divisors (see below), whose sum is σ = 2518746048. Its totient is φ = 164063232.

The previous prime is 722167709. The next prime is 722167781. The reversal of 722167740 is 47761227.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 722167695 and 722167704.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216324 + ... + 219636.

It is an arithmetic number, because the mean of its divisors is an integer number (17491292).

Almost surely, 2^722167740 is an apocalyptic number.

722167740 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722167740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1259373024).

722167740 is an abundant number, since it is smaller than the sum of its proper divisors (1796578308).

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

722167740 is a wasteful number, since it uses less digits than its factorization.

722167740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508 (or 3503 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 722167740 is about 26873.1788220151. The cubic root of 722167740 is about 897.1795407252.

The spelling of 722167740 in words is "seven hundred twenty-two million, one hundred sixty-seven thousand, seven hundred forty".