720279440 has 40 divisors (see below), whose sum is σ = 1675835448. Its totient is φ = 287907840.

The previous prime is 720279433. The next prime is 720279449. The reversal of 720279440 is 44972027.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42406144 + 677873296 = 6512^2 + 26036^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 720279440.

It is not an unprimeable number, because it can be changed into a prime (720279449) 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, 166910 + ... + 171170.

Almost surely, 2^720279440 is an apocalyptic number.

It is an amenable number.

720279440 is an abundant number, since it is smaller than the sum of its proper divisors (955556008).

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

720279440 is a wasteful number, since it uses less digits than its factorization.

720279440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387 (or 6381 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 720279440 is about 26838.0222818299. The cubic root of 720279440 is about 896.3968865123.

The spelling of 720279440 in words is "seven hundred twenty million, two hundred seventy-nine thousand, four hundred forty".