722131388 has 24 divisors (see below), whose sum is σ = 1390018224. Its totient is φ = 328239120.

The previous prime is 722131381. The next prime is 722131393. The reversal of 722131388 is 883131227.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722131381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62495 + ... + 73142.

It is an arithmetic number, because the mean of its divisors is an integer number (57917426).

Almost surely, 2^722131388 is an apocalyptic number.

It is an amenable number.

722131388 is a deficient number, since it is larger than the sum of its proper divisors (667886836).

722131388 is a wasteful number, since it uses less digits than its factorization.

722131388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135674 (or 135650 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 722131388 is about 26872.5024513907. The cubic root of 722131388 is about 897.1644865967.

The spelling of 722131388 in words is "seven hundred twenty-two million, one hundred thirty-one thousand, three hundred eighty-eight".