722557440 has 240 divisors, whose sum is σ = 2730869856. Its totient is φ = 175104000.

The previous prime is 722557439. The next prime is 722557457. The reversal of 722557440 is 44755227.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

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 = 722557395 and 722557404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 252015 + ... + 254865.

Almost surely, 2^722557440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722557440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365434928).

722557440 is an abundant number, since it is smaller than the sum of its proper divisors (2008312416).

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

722557440 is a wasteful number, since it uses less digits than its factorization.

722557440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891 (or 2872 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 36.

The square root of 722557440 is about 26880.4285680121. The cubic root of 722557440 is about 897.3408919721.

The spelling of 722557440 in words is "seven hundred twenty-two million, five hundred fifty-seven thousand, four hundred forty".