42778395 has 32 divisors (see below), whose sum is σ = 82967040. Its totient is φ = 20740320.

The previous prime is 42778391. The next prime is 42778403. The reversal of 42778395 is 59387724.

It is not a de Polignac number, because 42778395 - 2² = 42778391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 42778395.

It is not an unprimeable number, because it can be changed into a prime (42778391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12919 + ... + 15888.

It is an arithmetic number, because the mean of its divisors is an integer number (2592720).

Almost surely, 2^42778395 is an apocalyptic number.

42778395 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42778395 is a deficient number, since it is larger than the sum of its proper divisors (40188645).

42778395 is a wasteful number, since it uses less digits than its factorization.

42778395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28832 (or 28826 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 42778395 is about 6540.5194747818. The cubic root of 42778395 is about 349.7369315727.

The spelling of 42778395 in words is "forty-two million, seven hundred seventy-eight thousand, three hundred ninety-five".