420128618 has 16 divisors (see below), whose sum is σ = 775622400. Its totient is φ = 166204656.

The previous prime is 420128617. The next prime is 420128663. The reversal of 420128618 is 816821024.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (420128617) 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, 1154018 + ... + 1154381.

It is an arithmetic number, because the mean of its divisors is an integer number (48476400).

Almost surely, 2^420128618 is an apocalyptic number.

420128618 is a deficient number, since it is larger than the sum of its proper divisors (355493782).

420128618 is a wasteful number, since it uses less digits than its factorization.

420128618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308421.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 420128618 is about 20497.0392496087. The cubic root of 420128618 is about 748.9636756650.

The spelling of 420128618 in words is "four hundred twenty million, one hundred twenty-eight thousand, six hundred eighteen".