720567631 has 4 divisors (see below), whose sum is σ = 823505872. Its totient is φ = 617629392.

The previous prime is 720567619. The next prime is 720567643. The reversal of 720567631 is 136765027.

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

It is an interprime number because it is at equal distance from previous prime (720567619) and next prime (720567643).

It is a cyclic number.

It is not a de Polignac number, because 720567631 - 2¹¹ = 720565583 is a prime.

It is a super-2 number, since 2×720567631² = 1038435421689904322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720567691) 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, 51469110 + ... + 51469123.

It is an arithmetic number, because the mean of its divisors is an integer number (205876468).

Almost surely, 2^720567631 is an apocalyptic number.

720567631 is a deficient number, since it is larger than the sum of its proper divisors (102938241).

720567631 is a wasteful number, since it uses less digits than its factorization.

720567631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102938240.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 720567631 is about 26843.3908253037. The cubic root of 720567631 is about 896.5164230210.

The spelling of 720567631 in words is "seven hundred twenty million, five hundred sixty-seven thousand, six hundred thirty-one".