721532620723764 has 192 divisors, whose sum is σ = 1827007636027392. Its totient is φ = 220792366080000.

The previous prime is 721532620723751. The next prime is 721532620723801. The reversal of 721532620723764 is 467327026235127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13361440764 + ... + 13361494764.

It is an arithmetic number, because the mean of its divisors is an integer number (9515664770976).

Almost surely, 2^{721532620723764} 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 721532620723764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913503818013696).

721532620723764 is an abundant number, since it is smaller than the sum of its proper divisors (1105475015303628).

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

721532620723764 is a wasteful number, since it uses less digits than its factorization.

721532620723764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63686 (or 63684 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 57.

The spelling of 721532620723764 in words is "seven hundred twenty-one trillion, five hundred thirty-two billion, six hundred twenty million, seven hundred twenty-three thousand, seven hundred sixty-four".