42108979840 has 32 divisors (see below), whose sum is σ = 100666781460. Its totient is φ = 16843591680.

The previous prime is 42108979831. The next prime is 42108979883. The reversal of 42108979840 is 4897980124.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39365734464 + 2743245376 = 198408^2 + 52376^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32897001 + ... + 32898280.

Almost surely, 2^42108979840 is an apocalyptic number.

42108979840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42108979840 is an abundant number, since it is smaller than the sum of its proper divisors (58557801620).

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

42108979840 is an equidigital number, since it uses as much as digits as its factorization.

42108979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65795300 (or 65795288 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 42108979840 in words is "forty-two billion, one hundred eight million, nine hundred seventy-nine thousand, eight hundred forty".