720029081 has 4 divisors (see below), whose sum is σ = 744857700. Its totient is φ = 695200464.

The previous prime is 720029069. The next prime is 720029083. The reversal of 720029081 is 180920027.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 403367056 + 316662025 = 20084^2 + 17795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720029081 is a prime.

It is a super-2 number, since 2×720029081² = 1036883754971409122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 24828589 = 720029081 / (7 + 2 + 0 + 0 + 2 + 9 + 0 + 8 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720029083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12414266 + ... + 12414323.

It is an arithmetic number, because the mean of its divisors is an integer number (186214425).

Almost surely, 2^720029081 is an apocalyptic number.

It is an amenable number.

720029081 is a deficient number, since it is larger than the sum of its proper divisors (24828619).

720029081 is a wasteful number, since it uses less digits than its factorization.

720029081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24828618.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 720029081 is about 26833.3576169662. The cubic root of 720029081 is about 896.2930161611.

The spelling of 720029081 in words is "seven hundred twenty million, twenty-nine thousand, eighty-one".