642041676 has 18 divisors (see below), whose sum is σ = 1622938772. Its totient is φ = 214013880.

The previous prime is 642041663. The next prime is 642041677. The reversal of 642041676 is 676140246.

642041676 is a `hidden beast` number, since 642 + 0 + 4 + 1 + 6 + 7 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17834491 = 642041676 / (6 + 4 + 2 + 0 + 4 + 1 + 6 + 7 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 642041676.

It is not an unprimeable number, because it can be changed into a prime (642041677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8917210 + ... + 8917281.

Almost surely, 2^642041676 is an apocalyptic number.

It is an amenable number.

642041676 is an abundant number, since it is smaller than the sum of its proper divisors (980897096).

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

642041676 is a wasteful number, since it uses less digits than its factorization.

642041676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17834501 (or 17834496 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 642041676 is about 25338.5413155533. The cubic root of 642041676 is about 862.6892902750.

The spelling of 642041676 in words is "six hundred forty-two million, forty-one thousand, six hundred seventy-six".