42565761 has 36 divisors (see below), whose sum is σ = 71989632. Its totient is φ = 24164784.

The previous prime is 42565723. The next prime is 42565769. The reversal of 42565761 is 16756524.

It is a happy number.

It is not a de Polignac number, because 42565761 - 2¹⁵ = 42532993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42565769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 115800 + ... + 116166.

It is an arithmetic number, because the mean of its divisors is an integer number (1999712).

Almost surely, 2^42565761 is an apocalyptic number.

It is an amenable number.

42565761 is a deficient number, since it is larger than the sum of its proper divisors (29423871).

42565761 is a wasteful number, since it uses less digits than its factorization.

42565761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 640 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 42565761 is about 6524.2440941461. The cubic root of 42565761 is about 349.1565021417.

The spelling of 42565761 in words is "forty-two million, five hundred sixty-five thousand, seven hundred sixty-one".