722496640 has 32 divisors (see below), whose sum is σ = 1727220060. Its totient is φ = 288998400.

The previous prime is 722496601. The next prime is 722496653. The reversal of 722496640 is 46694227.

It can be written as a sum of positive squares in 2 ways, for example, as 693163584 + 29333056 = 26328^2 + 5416^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×722496640² = 1044002789622579200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 722496593 and 722496602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563811 + ... + 565090.

Almost surely, 2^722496640 is an apocalyptic number.

It is an amenable number.

722496640 is an abundant number, since it is smaller than the sum of its proper divisors (1004723420).

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

722496640 is a wasteful number, since it uses less digits than its factorization.

722496640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128920 (or 1128908 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 722496640 is about 26879.2976098707. The cubic root of 722496640 is about 897.3157221824.

The spelling of 722496640 in words is "seven hundred twenty-two million, four hundred ninety-six thousand, six hundred forty".