42561766 has 32 divisors (see below), whose sum is σ = 71322048. Its totient is φ = 18921600.

The previous prime is 42561749. The next prime is 42561773. The reversal of 42561766 is 66716524.

It is a happy number.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145116 + ... + 145408.

It is an arithmetic number, because the mean of its divisors is an integer number (2228814).

Almost surely, 2^42561766 is an apocalyptic number.

42561766 is a deficient number, since it is larger than the sum of its proper divisors (28760282).

42561766 is a wasteful number, since it uses less digits than its factorization.

42561766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496.

The product of its digits is 60480, while the sum is 37.

The square root of 42561766 is about 6523.9379212252. The cubic root of 42561766 is about 349.1455784647.

The spelling of 42561766 in words is "forty-two million, five hundred sixty-one thousand, seven hundred sixty-six".