42766778 has 4 divisors (see below), whose sum is σ = 64150170. Its totient is φ = 21383388.

The previous prime is 42766769. The next prime is 42766819. The reversal of 42766778 is 87766724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 30327049 + 12439729 = 5507^2 + 3527^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691693 + ... + 10691696.

Almost surely, 2^42766778 is an apocalyptic number.

42766778 is a deficient number, since it is larger than the sum of its proper divisors (21383392).

42766778 is a wasteful number, since it uses less digits than its factorization.

42766778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21383391.

The product of its digits is 790272, while the sum is 47.

The square root of 42766778 is about 6539.6313351748. The cubic root of 42766778 is about 349.7052702495.

The spelling of 42766778 in words is "forty-two million, seven hundred sixty-six thousand, seven hundred seventy-eight".