42581768 has 8 divisors (see below), whose sum is σ = 79840830. Its totient is φ = 21290880.

The previous prime is 42581761. The next prime is 42581771. The reversal of 42581768 is 86718524.

It can be written as a sum of positive squares in only one way, i.e., 25623844 + 16957924 = 5062^2 + 4118^2 .

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 (42581761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2661353 + ... + 2661368.

Almost surely, 2^42581768 is an apocalyptic number.

It is an amenable number.

42581768 is a deficient number, since it is larger than the sum of its proper divisors (37259062).

42581768 is a wasteful number, since it uses less digits than its factorization.

42581768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322727 (or 5322723 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 42581768 is about 6525.4707109909. The cubic root of 42581768 is about 349.2002638222.

The spelling of 42581768 in words is "forty-two million, five hundred eighty-one thousand, seven hundred sixty-eight".