720618811 has 8 divisors (see below), whose sum is σ = 804412224. Its totient is φ = 639872520.

The previous prime is 720618809. The next prime is 720618863. The reversal of 720618811 is 118816027.

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 720618811 - 2¹ = 720618809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720618881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761281 + ... + 762226.

It is an arithmetic number, because the mean of its divisors is an integer number (100551528).

Almost surely, 2^720618811 is an apocalyptic number.

720618811 is a deficient number, since it is larger than the sum of its proper divisors (83793413).

720618811 is a wasteful number, since it uses less digits than its factorization.

720618811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523561.

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 720618811 is about 26844.3441156606. The cubic root of 720618811 is about 896.5376482433.

The spelling of 720618811 in words is "seven hundred twenty million, six hundred eighteen thousand, eight hundred eleven".