42705721252 has 24 divisors (see below), whose sum is σ = 75052670616. Its totient is φ = 21262245888.

The previous prime is 42705721229. The next prime is 42705721297. The reversal of 42705721252 is 25212750724.

It can be written as a sum of positive squares in 4 ways, for example, as 3625966656 + 39079754596 = 60216^2 + 197686^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205748 + ... + 1240660.

It is an arithmetic number, because the mean of its divisors is an integer number (3127194609).

Almost surely, 2^42705721252 is an apocalyptic number.

It is an amenable number.

42705721252 is a deficient number, since it is larger than the sum of its proper divisors (32346949364).

42705721252 is a wasteful number, since it uses less digits than its factorization.

42705721252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36207 (or 36205 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 37.

The spelling of 42705721252 in words is "forty-two billion, seven hundred five million, seven hundred twenty-one thousand, two hundred fifty-two".