670721420 has 12 divisors (see below), whose sum is σ = 1408515024. Its totient is φ = 268288560.

The previous prime is 670721407. The next prime is 670721453. The reversal of 670721420 is 24127076.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16768016 + ... + 16768055.

It is an arithmetic number, because the mean of its divisors is an integer number (117376252).

Almost surely, 2^670721420 is an apocalyptic number.

It is an amenable number.

670721420 is an abundant number, since it is smaller than the sum of its proper divisors (737793604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

670721420 is a wasteful number, since it uses less digits than its factorization.

670721420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33536080 (or 33536078 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 670721420 is about 25898.2899049339. The cubic root of 670721420 is about 875.3479628311.

Adding to 670721420 its reverse (24127076), we get a palindrome (694848496).

The spelling of 670721420 in words is "six hundred seventy million, seven hundred twenty-one thousand, four hundred twenty".