720221364 has 18 divisors (see below), whose sum is σ = 1820559650. Its totient is φ = 240073776.

The previous prime is 720221347. The next prime is 720221377. The reversal of 720221364 is 463122027.

It can be written as a sum of positive squares in only one way, i.e., 692216100 + 28005264 = 26310^2 + 5292^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10003039 + ... + 10003110.

Almost surely, 2^720221364 is an apocalyptic number.

It is an amenable number.

720221364 is an abundant number, since it is smaller than the sum of its proper divisors (1100338286).

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

720221364 is a wasteful number, since it uses less digits than its factorization.

720221364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20006159 (or 20006154 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 720221364 is about 26836.9402875961. The cubic root of 720221364 is about 896.3727937588.

The spelling of 720221364 in words is "seven hundred twenty million, two hundred twenty-one thousand, three hundred sixty-four".