720321970 has 8 divisors (see below), whose sum is σ = 1296579564. Its totient is φ = 288128784.

The previous prime is 720321949. The next prime is 720321991. The reversal of 720321970 is 79123027.

It is an interprime number because it is at equal distance from previous prime (720321949) and next prime (720321991).

It can be written as a sum of positive squares in 2 ways, for example, as 699972849 + 20349121 = 26457^2 + 4511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36016089 + ... + 36016108.

Almost surely, 2^720321970 is an apocalyptic number.

720321970 is a deficient number, since it is larger than the sum of its proper divisors (576257594).

720321970 is a wasteful number, since it uses less digits than its factorization.

720321970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72032204.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 720321970 is about 26838.8146161488. The cubic root of 720321970 is about 896.4145292062.

Adding to 720321970 its reverse (79123027), we get a palindrome (799444997).

The spelling of 720321970 in words is "seven hundred twenty million, three hundred twenty-one thousand, nine hundred seventy".