42791665 has 16 divisors (see below), whose sum is σ = 60052608. Its totient is φ = 28659456.

The previous prime is 42791663. The next prime is 42791681. The reversal of 42791665 is 56619724.

It is not a de Polignac number, because 42791665 - 2¹ = 42791663 is a prime.

It is a super-2 number, since 2×42791665² = 3662253186944450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42791663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12712 + ... + 15721.

It is an arithmetic number, because the mean of its divisors is an integer number (3753288).

Almost surely, 2^42791665 is an apocalyptic number.

It is an amenable number.

42791665 is a deficient number, since it is larger than the sum of its proper divisors (17260943).

42791665 is a wasteful number, since it uses less digits than its factorization.

42791665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28488.

The product of its digits is 90720, while the sum is 40.

The square root of 42791665 is about 6541.5338415390. The cubic root of 42791665 is about 349.7730910194.

The spelling of 42791665 in words is "forty-two million, seven hundred ninety-one thousand, six hundred sixty-five".