722157640 has 32 divisors (see below), whose sum is σ = 1652400000. Its totient is φ = 283966144.

The previous prime is 722157629. The next prime is 722157647. The reversal of 722157640 is 46751227.

It is a junction number, because it is equal to n+sod(n) for n = 722157596 and 722157605.

It is not an unprimeable number, because it can be changed into a prime (722157647) 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, 150640 + ... + 155359.

It is an arithmetic number, because the mean of its divisors is an integer number (51637500).

Almost surely, 2^722157640 is an apocalyptic number.

It is an amenable number.

722157640 is an abundant number, since it is smaller than the sum of its proper divisors (930242360).

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

722157640 is a wasteful number, since it uses less digits than its factorization.

722157640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306069 (or 306065 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 722157640 is about 26872.9909016470. The cubic root of 722157640 is about 897.1753581533.

The spelling of 722157640 in words is "seven hundred twenty-two million, one hundred fifty-seven thousand, six hundred forty".