642082420 has 24 divisors (see below), whose sum is σ = 1540998144. Its totient is φ = 220142496.

The previous prime is 642082411. The next prime is 642082433. The reversal of 642082420 is 24280246.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2293012 + ... + 2293291.

It is an arithmetic number, because the mean of its divisors is an integer number (64208256).

Almost surely, 2^642082420 is an apocalyptic number.

It is an amenable number.

642082420 is an abundant number, since it is smaller than the sum of its proper divisors (898915724).

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

642082420 is a wasteful number, since it uses less digits than its factorization.

642082420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4586319 (or 4586317 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 642082420 is about 25339.3452954097. The cubic root of 642082420 is about 862.7075386589.

The spelling of 642082420 in words is "six hundred forty-two million, eighty-two thousand, four hundred twenty".