642420204420 has 48 divisors (see below), whose sum is σ = 1825623995328. Its totient is φ = 168755157120.

The previous prime is 642420204407. The next prime is 642420204443. The reversal of 642420204420 is 24402024246.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79898991 + ... + 79907030.

It is an arithmetic number, because the mean of its divisors is an integer number (38033833236).

Almost surely, 2^642420204420 is an apocalyptic number.

642420204420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642420204420 is an abundant number, since it is smaller than the sum of its proper divisors (1183203790908).

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

642420204420 is a wasteful number, since it uses less digits than its factorization.

642420204420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159806100 (or 159806098 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 642420204420 its reverse (24402024246), we get a palindrome (666822228666).

The spelling of 642420204420 in words is "six hundred forty-two billion, four hundred twenty million, two hundred four thousand, four hundred twenty".