720555265 has 8 divisors (see below), whose sum is σ = 867395880. Its totient is φ = 574624512.

The previous prime is 720555229. The next prime is 720555301. The reversal of 720555265 is 562555027.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (720555229) and next prime (720555301).

It can be written as a sum of positive squares in 4 ways, for example, as 89189136 + 631366129 = 9444^2 + 25127^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 720555265 - 2²¹ = 718458113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225720 + ... + 228889.

It is an arithmetic number, because the mean of its divisors is an integer number (108424485).

Almost surely, 2^720555265 is an apocalyptic number.

It is an amenable number.

720555265 is a deficient number, since it is larger than the sum of its proper divisors (146840615).

720555265 is a wasteful number, since it uses less digits than its factorization.

720555265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454931.

The product of its (nonzero) digits is 105000, while the sum is 37.

The square root of 720555265 is about 26843.1604882883. The cubic root of 720555265 is about 896.5112944784.

It can be divided in two parts, 720 and 555265, that added together give a triangular number (555985 = T₁₀₅₄).

The spelling of 720555265 in words is "seven hundred twenty million, five hundred fifty-five thousand, two hundred sixty-five".