720379081 has 2 divisors, whose sum is σ = 720379082. Its totient is φ = 720379080.

The previous prime is 720379031. The next prime is 720379103. The reversal of 720379081 is 180973027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665382025 + 54997056 = 25795^2 + 7416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720379081 is a prime.

It is a super-2 number, since 2×720379081² = 1037892040684809122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 720379081.

It is not a weakly prime, because it can be changed into another prime (720379031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360189540 + 360189541.

It is an arithmetic number, because the mean of its divisors is an integer number (360189541).

Almost surely, 2^720379081 is an apocalyptic number.

It is an amenable number.

720379081 is a deficient number, since it is larger than the sum of its proper divisors (1).

720379081 is an equidigital number, since it uses as much as digits as its factorization.

720379081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 720379081 is about 26839.8785578475. The cubic root of 720379081 is about 896.4382194352.

It can be divided in two parts, 72037 and 9081, that added together give a palindrome (81118).

The spelling of 720379081 in words is "seven hundred twenty million, three hundred seventy-nine thousand, eighty-one".