42857766 has 96 divisors (see below), whose sum is σ = 113106240. Its totient is φ = 11467008.

The previous prime is 42857747. The next prime is 42857767. The reversal of 42857766 is 66775824.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42857767) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135040 + ... + 135356.

It is an arithmetic number, because the mean of its divisors is an integer number (1178190).

Almost surely, 2^42857766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42857766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56553120).

42857766 is an abundant number, since it is smaller than the sum of its proper divisors (70248474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42857766 is a wasteful number, since it uses less digits than its factorization.

42857766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 395 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 42857766 is about 6546.5843002286. The cubic root of 42857766 is about 349.9530984772.

The spelling of 42857766 in words is "forty-two million, eight hundred fifty-seven thousand, seven hundred sixty-six".