42778479 has 4 divisors (see below), whose sum is σ = 57037976. Its totient is φ = 28518984.

The previous prime is 42778469. The next prime is 42778487. The reversal of 42778479 is 97487724.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42778479 - 2⁵ = 42778447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42778469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7129744 + ... + 7129749.

It is an arithmetic number, because the mean of its divisors is an integer number (14259494).

Almost surely, 2^42778479 is an apocalyptic number.

42778479 is a deficient number, since it is larger than the sum of its proper divisors (14259497).

42778479 is a wasteful number, since it uses less digits than its factorization.

42778479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14259496.

The product of its digits is 790272, while the sum is 48.

The square root of 42778479 is about 6540.5258962869. The cubic root of 42778479 is about 349.7371604879.

The spelling of 42778479 in words is "forty-two million, seven hundred seventy-eight thousand, four hundred seventy-nine".