720673887 has 4 divisors (see below), whose sum is σ = 960898520. Its totient is φ = 480449256.

The previous prime is 720673831. The next prime is 720673897. The reversal of 720673887 is 788376027.

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

It is not a de Polignac number, because 720673887 - 2¹⁸ = 720411743 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 (720673897) 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, 120112312 + ... + 120112317.

It is an arithmetic number, because the mean of its divisors is an integer number (240224630).

Almost surely, 2^720673887 is an apocalyptic number.

720673887 is a deficient number, since it is larger than the sum of its proper divisors (240224633).

720673887 is a wasteful number, since it uses less digits than its factorization.

720673887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240224632.

The product of its (nonzero) digits is 790272, while the sum is 48.

The square root of 720673887 is about 26845.3699359871. The cubic root of 720673887 is about 896.5604880807.

The spelling of 720673887 in words is "seven hundred twenty million, six hundred seventy-three thousand, eight hundred eighty-seven".