720452261 has 4 divisors (see below), whose sum is σ = 721389900. Its totient is φ = 719514624.

The previous prime is 720452251. The next prime is 720452263. The reversal of 720452261 is 162254027.

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 246301636 + 474150625 = 15694^2 + 21775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720452261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720452263) 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, 467666 + ... + 469203.

It is an arithmetic number, because the mean of its divisors is an integer number (180347475).

Almost surely, 2^720452261 is an apocalyptic number.

It is an amenable number.

720452261 is a deficient number, since it is larger than the sum of its proper divisors (937639).

720452261 is an equidigital number, since it uses as much as digits as its factorization.

720452261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937638.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 720452261 is about 26841.2417931809. The cubic root of 720452261 is about 896.4685734203.

The spelling of 720452261 in words is "seven hundred twenty million, four hundred fifty-two thousand, two hundred sixty-one".