42756305 has 8 divisors (see below), whose sum is σ = 51577344. Its totient is φ = 34025200.

The previous prime is 42756293. The next prime is 42756313. The reversal of 42756305 is 50365724.

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

It is a de Polignac number, because none of the positive numbers 2^k-42756305 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21431 + ... + 23340.

It is an arithmetic number, because the mean of its divisors is an integer number (6447168).

Almost surely, 2^42756305 is an apocalyptic number.

It is an amenable number.

42756305 is a deficient number, since it is larger than the sum of its proper divisors (8821039).

42756305 is a wasteful number, since it uses less digits than its factorization.

42756305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44967.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 42756305 is about 6538.8305529353. The cubic root of 42756305 is about 349.6767219037.

The spelling of 42756305 in words is "forty-two million, seven hundred fifty-six thousand, three hundred five".