720619691 has 8 divisors (see below), whose sum is σ = 786336768. Its totient is φ = 654937000.

The previous prime is 720619667. The next prime is 720619699. The reversal of 720619691 is 196916027.

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 720619691 - 2¹⁴ = 720603307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720619699) 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 7 ways as a sum of consecutive naturals, for example, 57086 + ... + 68556.

It is an arithmetic number, because the mean of its divisors is an integer number (98292096).

Almost surely, 2^720619691 is an apocalyptic number.

720619691 is a deficient number, since it is larger than the sum of its proper divisors (65717077).

720619691 is a wasteful number, since it uses less digits than its factorization.

720619691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17193.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 720619691 is about 26844.3605064453. The cubic root of 720619691 is about 896.5380131855.

The spelling of 720619691 in words is "seven hundred twenty million, six hundred nineteen thousand, six hundred ninety-one".