420766505 has 8 divisors (see below), whose sum is σ = 509919624. Its totient is φ = 333280000.

The previous prime is 420766501. The next prime is 420766543. The reversal of 420766505 is 505667024.

It can be written as a sum of positive squares in 4 ways, for example, as 115949824 + 304816681 = 10768^2 + 17459^2 .

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

It is not a de Polignac number, because 420766505 - 2² = 420766501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420766501) 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, 416096 + ... + 417105.

It is an arithmetic number, because the mean of its divisors is an integer number (63739953).

Almost surely, 2^420766505 is an apocalyptic number.

It is an amenable number.

420766505 is a deficient number, since it is larger than the sum of its proper divisors (89153119).

420766505 is a wasteful number, since it uses less digits than its factorization.

420766505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833307.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 420766505 is about 20512.5938145326. The cubic root of 420766505 is about 749.3425379006.

The spelling of 420766505 in words is "four hundred twenty million, seven hundred sixty-six thousand, five hundred five".