721341072 has 80 divisors (see below), whose sum is σ = 2089648000. Its totient is φ = 238225536.

The previous prime is 721341029. The next prime is 721341073. The reversal of 721341072 is 270143127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (721341073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39429 + ... + 54747.

It is an arithmetic number, because the mean of its divisors is an integer number (26120600).

Almost surely, 2^721341072 is an apocalyptic number.

721341072 is a gapful number since it is divisible by the number (72) 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 721341072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1044824000).

721341072 is an abundant number, since it is smaller than the sum of its proper divisors (1368306928).

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

721341072 is a wasteful number, since it uses less digits than its factorization.

721341072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15445 (or 15433 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 721341072 is about 26857.7935057964. The cubic root of 721341072 is about 896.8370751396.

Adding to 721341072 its reverse (270143127), we get a palindrome (991484199).

The spelling of 721341072 in words is "seven hundred twenty-one million, three hundred forty-one thousand, seventy-two".