42724843605 has 30 divisors (see below), whose sum is σ = 76595695638. Its totient is φ = 22784364720.

The previous prime is 42724843573. The next prime is 42724843613. The reversal of 42724843605 is 50634842724.

It is a happy number.

42724843605 is a `hidden beast` number, since 42 + 7 + 248 + 4 + 360 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 34179874884 + 8544968721 = 184878^2 + 92439^2 .

It is not a de Polignac number, because 42724843605 - 2⁵ = 42724843573 is a prime.

It is a super-2 number, since 2×42724843605² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4154620 + ... + 4164890.

Almost surely, 2^42724843605 is an apocalyptic number.

42724843605 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42724843605 is a deficient number, since it is larger than the sum of its proper divisors (33870852033).

42724843605 is an frugal number, since it uses more digits than its factorization.

42724843605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20559 (or 10279 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 45.

Multiplying 42724843605 by its sum of digits (45), we get a square (1922617962225 = 1386585²).

42724843605 divided by its sum of digits (45) gives a square (949440969 = 30813²).

The spelling of 42724843605 in words is "forty-two billion, seven hundred twenty-four million, eight hundred forty-three thousand, six hundred five".