640119420 has 36 divisors (see below), whose sum is σ = 1941696120. Its totient is φ = 170698464.

The previous prime is 640119401. The next prime is 640119427. The reversal of 640119420 is 24911046.

640119420 is a `hidden beast` number, since 640 + 1 + 19 + 4 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×640119420² = 819505743722272800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640119427) 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, 1777930 + ... + 1778289.

Almost surely, 2^640119420 is an apocalyptic number.

640119420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640119420 is an abundant number, since it is smaller than the sum of its proper divisors (1301576700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640119420 is a wasteful number, since it uses less digits than its factorization.

640119420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556234 (or 3556229 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 640119420 is about 25300.5814162442. The cubic root of 640119420 is about 861.8274732190.

The spelling of 640119420 in words is "six hundred forty million, one hundred nineteen thousand, four hundred twenty".