720544140 has 48 divisors (see below), whose sum is σ = 2241694560. Its totient is φ = 192144960.

The previous prime is 720544109. The next prime is 720544141. The reversal of 720544140 is 41445027.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (720544141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666631 + ... + 667710.

It is an arithmetic number, because the mean of its divisors is an integer number (46701970).

Almost surely, 2^720544140 is an apocalyptic number.

It is an amenable number.

720544140 is an abundant number, since it is smaller than the sum of its proper divisors (1521150420).

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

720544140 is a wasteful number, since it uses less digits than its factorization.

720544140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334359 (or 1334351 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 720544140 is about 26842.9532652426. The cubic root of 720544140 is about 896.5066805647.

Adding to 720544140 its reverse (41445027), we get a palindrome (761989167).

The spelling of 720544140 in words is "seven hundred twenty million, five hundred forty-four thousand, one hundred forty".