642019804 has 24 divisors (see below), whose sum is σ = 1186012800. Its totient is φ = 303254640.

The previous prime is 642019789. The next prime is 642019849. The reversal of 642019804 is 408910246.

It is a self number, because there is not a number n which added to its sum of digits gives 642019804.

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, 15519 + ... + 39049.

It is an arithmetic number, because the mean of its divisors is an integer number (49417200).

Almost surely, 2^642019804 is an apocalyptic number.

It is an amenable number.

642019804 is a deficient number, since it is larger than the sum of its proper divisors (543992996).

642019804 is a wasteful number, since it uses less digits than its factorization.

642019804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23913 (or 23911 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 642019804 is about 25338.1097163936. The cubic root of 642019804 is about 862.6794939461.

The spelling of 642019804 in words is "six hundred forty-two million, nineteen thousand, eight hundred four".