42808765 has 8 divisors (see below), whose sum is σ = 51547608. Its totient is φ = 34128960.

The previous prime is 42808699. The next prime is 42808781. The reversal of 42808765 is 56780824.

It can be written as a sum of positive squares in 4 ways, for example, as 3345241 + 39463524 = 1829^2 + 6282^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42808765 - 2⁷ = 42808637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13146 + ... + 16075.

It is an arithmetic number, because the mean of its divisors is an integer number (6443451).

Almost surely, 2^42808765 is an apocalyptic number.

It is an amenable number.

42808765 is a deficient number, since it is larger than the sum of its proper divisors (8738843).

42808765 is a wasteful number, since it uses less digits than its factorization.

42808765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29519.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 42808765 is about 6542.8407438971. The cubic root of 42808765 is about 349.8196758183.

The spelling of 42808765 in words is "forty-two million, eight hundred eight thousand, seven hundred sixty-five".