721571620 has 192 divisors, whose sum is σ = 1985679360. Its totient is φ = 213696000.

The previous prime is 721571611. The next prime is 721571621. The reversal of 721571620 is 26175127.

It is not an unprimeable number, because it can be changed into a prime (721571621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4778545 + ... + 4778695.

It is an arithmetic number, because the mean of its divisors is an integer number (10342080).

Almost surely, 2^721571620 is an apocalyptic number.

721571620 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 721571620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992839680).

721571620 is an abundant number, since it is smaller than the sum of its proper divisors (1264107740).

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

721571620 is a wasteful number, since it uses less digits than its factorization.

721571620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 721571620 is about 26862.0851759501. The cubic root of 721571620 is about 896.9326110694.

The spelling of 721571620 in words is "seven hundred twenty-one million, five hundred seventy-one thousand, six hundred twenty".