642104520 has 32 divisors (see below), whose sum is σ = 1926313920. Its totient is φ = 171227840.

The previous prime is 642104513. The next prime is 642104521. The reversal of 642104520 is 25401246.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (642104521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2675316 + ... + 2675555.

It is an arithmetic number, because the mean of its divisors is an integer number (60197310).

Almost surely, 2^642104520 is an apocalyptic number.

642104520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642104520 is an abundant number, since it is smaller than the sum of its proper divisors (1284209400).

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

642104520 is a wasteful number, since it uses less digits than its factorization.

642104520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350885 (or 5350881 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 642104520 is about 25339.7813723797. The cubic root of 642104520 is about 862.7174364630.

Adding to 642104520 its reverse (25401246), we get a palindrome (667505766).

The spelling of 642104520 in words is "six hundred forty-two million, one hundred four thousand, five hundred twenty".