720166520 has 64 divisors (see below), whose sum is σ = 1669507200. Its totient is φ = 279383040.

The previous prime is 720166493. The next prime is 720166543. The reversal of 720166520 is 25661027.

720166520 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637316 + ... + 638444.

It is an arithmetic number, because the mean of its divisors is an integer number (26086050).

Almost surely, 2^720166520 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 720166520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834753600).

720166520 is an abundant number, since it is smaller than the sum of its proper divisors (949340680).

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

720166520 is a wasteful number, since it uses less digits than its factorization.

720166520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 720166520 is about 26835.9184676061. The cubic root of 720166520 is about 896.3500406074.

The spelling of 720166520 in words is "seven hundred twenty million, one hundred sixty-six thousand, five hundred twenty".