42778354 has 4 divisors (see below), whose sum is σ = 64167534. Its totient is φ = 21389176.

The previous prime is 42778349. The next prime is 42778369. The reversal of 42778354 is 45387724.

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., 38254225 + 4524129 = 6185^2 + 2127^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694587 + ... + 10694590.

Almost surely, 2^42778354 is an apocalyptic number.

42778354 is a deficient number, since it is larger than the sum of its proper divisors (21389180).

42778354 is a wasteful number, since it uses less digits than its factorization.

42778354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21389179.

The product of its digits is 188160, while the sum is 40.

The square root of 42778354 is about 6540.5163404734. The cubic root of 42778354 is about 349.7368198401.

The spelling of 42778354 in words is "forty-two million, seven hundred seventy-eight thousand, three hundred fifty-four".