420678643 has 12 divisors (see below), whose sum is σ = 528456880. Its totient is φ = 327800880.

The previous prime is 420678619. The next prime is 420678653. The reversal of 420678643 is 346876024.

It is a happy number.

It is not a de Polignac number, because 420678643 - 2²¹ = 418581491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420678596 and 420678605.

It is not an unprimeable number, because it can be changed into a prime (420678653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247488 + ... + 249181.

Almost surely, 2^420678643 is an apocalyptic number.

420678643 is a deficient number, since it is larger than the sum of its proper divisors (107778237).

420678643 is a wasteful number, since it uses less digits than its factorization.

420678643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496698 (or 496687 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 420678643 is about 20510.4520428000. The cubic root of 420678643 is about 749.2903764948.

The spelling of 420678643 in words is "four hundred twenty million, six hundred seventy-eight thousand, six hundred forty-three".