642018104 has 64 divisors (see below), whose sum is σ = 1485570240. Its totient is φ = 253301760.

The previous prime is 642018103. The next prime is 642018121. The reversal of 642018104 is 401810246.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642018101) 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 15 ways as a sum of consecutive naturals, for example, 334652 + ... + 336564.

It is an arithmetic number, because the mean of its divisors is an integer number (23212035).

Almost surely, 2^642018104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642018104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742785120).

642018104 is an abundant number, since it is smaller than the sum of its proper divisors (843552136).

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

642018104 is a wasteful number, since it uses less digits than its factorization.

642018104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400 (or 2396 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 642018104 is about 25338.0761700647. The cubic root of 642018104 is about 862.6787325176.

The spelling of 642018104 in words is "six hundred forty-two million, eighteen thousand, one hundred four".