720164887 has 4 divisors (see below), whose sum is σ = 775562200. Its totient is φ = 664767576.

The previous prime is 720164873. The next prime is 720164899. The reversal of 720164887 is 788461027.

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 720164887 - 2⁷ = 720164759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720168887) 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, 27698637 + ... + 27698662.

It is an arithmetic number, because the mean of its divisors is an integer number (193890550).

Almost surely, 2^720164887 is an apocalyptic number.

720164887 is a deficient number, since it is larger than the sum of its proper divisors (55397313).

720164887 is a wasteful number, since it uses less digits than its factorization.

720164887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55397312.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 720164887 is about 26835.8880419486. Note that the first 3 decimals coincide. The cubic root of 720164887 is about 896.3493631063.

The spelling of 720164887 in words is "seven hundred twenty million, one hundred sixty-four thousand, eight hundred eighty-seven".