721980400 has 30 divisors (see below), whose sum is σ = 1734558872. Its totient is φ = 288792000.

The previous prime is 721980379. The next prime is 721980401. The reversal of 721980400 is 4089127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721980401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 902076 + ... + 902875.

Almost surely, 2^721980400 is an apocalyptic number.

It is an amenable number.

721980400 is an abundant number, since it is smaller than the sum of its proper divisors (1012578472).

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

721980400 is a wasteful number, since it uses less digits than its factorization.

721980400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804969 (or 1804958 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 721980400 is about 26869.6929643790. The cubic root of 721980400 is about 897.1019538795.

The spelling of 721980400 in words is "seven hundred twenty-one million, nine hundred eighty thousand, four hundred".