720643051 has 4 divisors (see below), whose sum is σ = 732857400. Its totient is φ = 708428704.

The previous prime is 720643013. The next prime is 720643093. The reversal of 720643051 is 150346027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150346027 = 13 ⋅11565079.

It is a cyclic number.

It is not a de Polignac number, because 720643051 - 2²¹ = 718545899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720643351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6107086 + ... + 6107203.

It is an arithmetic number, because the mean of its divisors is an integer number (183214350).

Almost surely, 2^720643051 is an apocalyptic number.

720643051 is a deficient number, since it is larger than the sum of its proper divisors (12214349).

720643051 is a wasteful number, since it uses less digits than its factorization.

720643051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12214348.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 720643051 is about 26844.7956036175. The cubic root of 720643051 is about 896.5477006355.

Adding to 720643051 its reverse (150346027), we get a palindrome (870989078).

The spelling of 720643051 in words is "seven hundred twenty million, six hundred forty-three thousand, fifty-one".