720888631 has 4 divisors (see below), whose sum is σ = 731042064. Its totient is φ = 710735200.

The previous prime is 720888607. The next prime is 720888653. The reversal of 720888631 is 136888027.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720888631 - 2¹⁹ = 720364343 is a prime.

It is a super-2 number, since 2×720888631² = 1039360836610108322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720888431) 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, 5076610 + ... + 5076751.

It is an arithmetic number, because the mean of its divisors is an integer number (182760516).

Almost surely, 2^720888631 is an apocalyptic number.

720888631 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

720888631 is a deficient number, since it is larger than the sum of its proper divisors (10153433).

720888631 is a wasteful number, since it uses less digits than its factorization.

720888631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10153432.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 720888631 is about 26849.3692849571. The cubic root of 720888631 is about 896.6495306046.

The spelling of 720888631 in words is "seven hundred twenty million, eight hundred eighty-eight thousand, six hundred thirty-one".