42778623 has 8 divisors (see below), whose sum is σ = 58579888. Its totient is φ = 27748224.

The previous prime is 42778609. The next prime is 42778627. The reversal of 42778623 is 32687724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42778623 - 2⁴ = 42778607 is a prime.

It is a super-2 number, since 2×42778623² = 3660021171552258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42778627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192586 + ... + 192807.

It is an arithmetic number, because the mean of its divisors is an integer number (7322486).

Almost surely, 2^42778623 is an apocalyptic number.

42778623 is a deficient number, since it is larger than the sum of its proper divisors (15801265).

42778623 is a wasteful number, since it uses less digits than its factorization.

42778623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385433.

The product of its digits is 112896, while the sum is 39.

The square root of 42778623 is about 6540.5369045668. The cubic root of 42778623 is about 349.7375529134.

The spelling of 42778623 in words is "forty-two million, seven hundred seventy-eight thousand, six hundred twenty-three".