720905251 has 8 divisors (see below), whose sum is σ = 795279600. Its totient is φ = 648003840.

The previous prime is 720905249. The next prime is 720905329. The reversal of 720905251 is 152509027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 720905251 - 2¹ = 720905249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720905231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367206 + ... + 369163.

It is an arithmetic number, because the mean of its divisors is an integer number (99409950).

Almost surely, 2^720905251 is an apocalyptic number.

720905251 is a deficient number, since it is larger than the sum of its proper divisors (74374349).

720905251 is a wasteful number, since it uses less digits than its factorization.

720905251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736469.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 720905251 is about 26849.6787876503. The cubic root of 720905251 is about 896.6564212671.

The spelling of 720905251 in words is "seven hundred twenty million, nine hundred five thousand, two hundred fifty-one".