720047621 has 4 divisors (see below), whose sum is σ = 720141312. Its totient is φ = 719953932.

The previous prime is 720047611. The next prime is 720047651. The reversal of 720047621 is 126740027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126740027 = 239 ⋅530293.

It is a cyclic number.

It is not a de Polignac number, because 720047621 - 2²⁶ = 652938757 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 (720047611) 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, 34175 + ... + 51068.

It is an arithmetic number, because the mean of its divisors is an integer number (180035328).

Almost surely, 2^720047621 is an apocalyptic number.

It is an amenable number.

720047621 is a deficient number, since it is larger than the sum of its proper divisors (93691).

720047621 is an equidigital number, since it uses as much as digits as its factorization.

720047621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93690.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 720047621 is about 26833.7030802683. The cubic root of 720047621 is about 896.3007089661.

Adding to 720047621 its reverse (126740027), we get a palindrome (846787648).

The spelling of 720047621 in words is "seven hundred twenty million, forty-seven thousand, six hundred twenty-one".