721700 has 36 divisors (see below), whose sum is σ = 1791552. Its totient is φ = 247200.

The previous prime is 721697. The next prime is 721703. The reversal of 721700 is 7127.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (721697) and next prime (721703).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721700.

It is not an unprimeable number, because it can be changed into a prime (721703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185 + ... + 1215.

2⁷²¹⁷⁰⁰ is an apocalyptic number.

721700 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 721700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895776).

721700 is an abundant number, since it is smaller than the sum of its proper divisors (1069852).

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

721700 is a wasteful number, since it uses less digits than its factorization.

721700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052 (or 1045 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 17.

The square root of 721700 is about 849.5292814259. The cubic root of 721700 is about 89.6985801160.

Adding to 721700 its reverse (7127), we get a palindrome (728827).

The spelling of 721700 in words is "seven hundred twenty-one thousand, seven hundred", and thus it is an iban number.