720565620 has 96 divisors (see below), whose sum is σ = 2154442752. Its totient is φ = 179507328.

The previous prime is 720565609. The next prime is 720565673. The reversal of 720565620 is 26565027.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53269 + ... + 65411.

It is an arithmetic number, because the mean of its divisors is an integer number (22442112).

Almost surely, 2^720565620 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 720565620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1077221376).

720565620 is an abundant number, since it is smaller than the sum of its proper divisors (1433877132).

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

720565620 is a wasteful number, since it uses less digits than its factorization.

720565620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12221 (or 12219 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 720565620 is about 26843.3533672677. The cubic root of 720565620 is about 896.5155890044.

The spelling of 720565620 in words is "seven hundred twenty million, five hundred sixty-five thousand, six hundred twenty".