642541420 has 48 divisors (see below), whose sum is σ = 1369363968. Its totient is φ = 253229760.

The previous prime is 642541379. The next prime is 642541421. The reversal of 642541420 is 24145246.

642541420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (642541421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450829 + ... + 452251.

It is an arithmetic number, because the mean of its divisors is an integer number (28528416).

Almost surely, 2^642541420 is an apocalyptic number.

It is an amenable number.

642541420 is an abundant number, since it is smaller than the sum of its proper divisors (726822548).

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

642541420 is a wasteful number, since it uses less digits than its factorization.

642541420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750 (or 1748 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 642541420 is about 25348.4007385081. The cubic root of 642541420 is about 862.9130618274.

Adding to 642541420 its reverse (24145246), we get a palindrome (666686666).

The spelling of 642541420 in words is "six hundred forty-two million, five hundred forty-one thousand, four hundred twenty".