721622753280 has 1568 divisors, whose sum is σ = 3068478231840. Its totient is φ = 161482014720.

The previous prime is 721622753273. The next prime is 721622753287. The reversal of 721622753280 is 82357226127.

721622753280 is a `hidden beast` number, since 7 + 2 + 16 + 2 + 27 + 532 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (721622753273) and next prime (721622753287).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721622753287) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 55509442554 + ... + 55509442566.

Almost surely, 2^721622753280 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 721622753280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1534239115920).

721622753280 is an abundant number, since it is smaller than the sum of its proper divisors (2346855478560).

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

721622753280 is an frugal number, since it uses more digits than its factorization.

721622753280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 721622753280 in words is "seven hundred twenty-one billion, six hundred twenty-two million, seven hundred fifty-three thousand, two hundred eighty".