420721567 has 8 divisors (see below), whose sum is σ = 481751712. Its totient is φ = 359923200.

The previous prime is 420721537. The next prime is 420721571. The reversal of 420721567 is 765127024.

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

It is a de Polignac number, because none of the positive numbers 2^k-420721567 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 (420721537) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54034 + ... + 61327.

It is an arithmetic number, because the mean of its divisors is an integer number (60218964).

Almost surely, 2^420721567 is an apocalyptic number.

420721567 is a deficient number, since it is larger than the sum of its proper divisors (61030145).

420721567 is a wasteful number, since it uses less digits than its factorization.

420721567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115889.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 420721567 is about 20511.4984094288. The cubic root of 420721567 is about 749.3158602750.

The spelling of 420721567 in words is "four hundred twenty million, seven hundred twenty-one thousand, five hundred sixty-seven".