42778361 has 8 divisors (see below), whose sum is σ = 43577664. Its totient is φ = 41983920.

The previous prime is 42778349. The next prime is 42778369. The reversal of 42778361 is 16387724.

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

It is a cyclic number.

It is not a de Polignac number, because 42778361 - 2¹⁰ = 42777337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42778369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19811 + ... + 21863.

It is an arithmetic number, because the mean of its divisors is an integer number (5447208).

Almost surely, 2^42778361 is an apocalyptic number.

It is an amenable number.

42778361 is a deficient number, since it is larger than the sum of its proper divisors (799303).

42778361 is a wasteful number, since it uses less digits than its factorization.

42778361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431.

The product of its digits is 56448, while the sum is 38.

The square root of 42778361 is about 6540.5168755994. The cubic root of 42778361 is about 349.7368389164.

The spelling of 42778361 in words is "forty-two million, seven hundred seventy-eight thousand, three hundred sixty-one".