42738778 has 4 divisors (see below), whose sum is σ = 64108170. Its totient is φ = 21369388.

The previous prime is 42738757. The next prime is 42738781. The reversal of 42738778 is 87783724.

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., 37662769 + 5076009 = 6137^2 + 2253^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10684693 + ... + 10684696.

Almost surely, 2^42738778 is an apocalyptic number.

42738778 is a deficient number, since it is larger than the sum of its proper divisors (21369392).

42738778 is a wasteful number, since it uses less digits than its factorization.

42738778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21369391.

The product of its digits is 526848, while the sum is 46.

The square root of 42738778 is about 6537.4901911972. The cubic root of 42738778 is about 349.6289346316.

The spelling of 42738778 in words is "forty-two million, seven hundred thirty-eight thousand, seven hundred seventy-eight".