720777641220 has 576 divisors, whose sum is σ = 2751840000000. Its totient is φ = 151743062016.

The previous prime is 720777641219. The next prime is 720777641263. The reversal of 720777641220 is 22146777027.

720777641220 is a `hidden beast` number, since 7 + 207 + 7 + 7 + 6 + 412 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 577083156 + ... + 577084404.

It is an arithmetic number, because the mean of its divisors is an integer number (4777500000).

Almost surely, 2^720777641220 is an apocalyptic number.

720777641220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720777641220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375920000000).

720777641220 is an abundant number, since it is smaller than the sum of its proper divisors (2031062358780).

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

720777641220 is a wasteful number, since it uses less digits than its factorization.

720777641220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017 (or 1998 counting only the distinct ones).

The product of its (nonzero) digits is 460992, while the sum is 45.

The spelling of 720777641220 in words is "seven hundred twenty billion, seven hundred seventy-seven million, six hundred forty-one thousand, two hundred twenty".