420727765 has 8 divisors (see below), whose sum is σ = 505030968. Its totient is φ = 336477120.

The previous prime is 420727763. The next prime is 420727787. The reversal of 420727765 is 567727024.

It can be written as a sum of positive squares in 4 ways, for example, as 97950609 + 322777156 = 9897^2 + 17966^2 .

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

It is not a de Polignac number, because 420727765 - 2¹ = 420727763 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 (420727763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7395 + ... + 29935.

It is an arithmetic number, because the mean of its divisors is an integer number (63128871).

Almost surely, 2^420727765 is an apocalyptic number.

It is an amenable number.

420727765 is a deficient number, since it is larger than the sum of its proper divisors (84303203).

420727765 is a wasteful number, since it uses less digits than its factorization.

420727765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26279.

The product of its (nonzero) digits is 164640, while the sum is 40.

The square root of 420727765 is about 20511.6494948602. The cubic root of 420727765 is about 749.3195398557.

The spelling of 420727765 in words is "four hundred twenty million, seven hundred twenty-seven thousand, seven hundred sixty-five".