420664634 has 32 divisors (see below), whose sum is σ = 693463680. Its totient is φ = 190209600.

The previous prime is 420664613. The next prime is 420664649. The reversal of 420664634 is 436466024.

It is a junction number, because it is equal to n+sod(n) for n = 420664594 and 420664603.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333497 + ... + 334755.

It is an arithmetic number, because the mean of its divisors is an integer number (21670740).

Almost surely, 2^420664634 is an apocalyptic number.

420664634 is a deficient number, since it is larger than the sum of its proper divisors (272799046).

420664634 is a wasteful number, since it uses less digits than its factorization.

420664634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526.

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 420664634 is about 20510.1105311502. The cubic root of 420664634 is about 749.2820590411.

The spelling of 420664634 in words is "four hundred twenty million, six hundred sixty-four thousand, six hundred thirty-four".