42216872 has 8 divisors (see below), whose sum is σ = 79156650. Its totient is φ = 21108432.

The previous prime is 42216869. The next prime is 42216877. The reversal of 42216872 is 27861224.

It can be written as a sum of positive squares in only one way, i.e., 21659716 + 20557156 = 4654^2 + 4534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (42216877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638547 + ... + 2638562.

Almost surely, 2^42216872 is an apocalyptic number.

It is an amenable number.

42216872 is a deficient number, since it is larger than the sum of its proper divisors (36939778).

42216872 is a wasteful number, since it uses less digits than its factorization.

42216872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277115 (or 5277111 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 42216872 is about 6497.4511925831. The cubic root of 42216872 is about 348.1999335550.

The spelling of 42216872 in words is "forty-two million, two hundred sixteen thousand, eight hundred seventy-two".