720687540 has 24 divisors (see below), whose sum is σ = 2017925280. Its totient is φ = 192183328.

The previous prime is 720687529. The next prime is 720687551. The reversal of 720687540 is 45786027.

It is an interprime number because it is at equal distance from previous prime (720687529) and next prime (720687551).

It is a super-2 number, since 2×720687540² = 1038781060622503200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6005670 + ... + 6005789.

It is an arithmetic number, because the mean of its divisors is an integer number (84080220).

Almost surely, 2^720687540 is an apocalyptic number.

It is an amenable number.

720687540 is an abundant number, since it is smaller than the sum of its proper divisors (1297237740).

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

720687540 is a wasteful number, since it uses less digits than its factorization.

720687540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12011471 (or 12011469 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 720687540 is about 26845.6242244430. The cubic root of 720687540 is about 896.5661497553.

The spelling of 720687540 in words is "seven hundred twenty million, six hundred eighty-seven thousand, five hundred forty".