42757661 has 4 divisors (see below), whose sum is σ = 42773472. Its totient is φ = 42741852.

The previous prime is 42757579. The next prime is 42757679. The reversal of 42757661 is 16675724.

42757661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42757661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42757361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2711 + ... + 9636.

It is an arithmetic number, because the mean of its divisors is an integer number (10693368).

Almost surely, 2^42757661 is an apocalyptic number.

It is an amenable number.

42757661 is a deficient number, since it is larger than the sum of its proper divisors (15811).

42757661 is a wasteful number, since it uses less digits than its factorization.

42757661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15810.

The product of its digits is 70560, while the sum is 38.

The square root of 42757661 is about 6538.9342403789. The cubic root of 42757661 is about 349.6804184862.

The spelling of 42757661 in words is "forty-two million, seven hundred fifty-seven thousand, six hundred sixty-one".