42648779 has 4 divisors (see below), whose sum is σ = 42666000. Its totient is φ = 42631560.

The previous prime is 42648773. The next prime is 42648791. The reversal of 42648779 is 97784624.

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

It is a cyclic number.

It is not a de Polignac number, because 42648779 - 2⁸ = 42648523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42648773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4112 + ... + 10109.

It is an arithmetic number, because the mean of its divisors is an integer number (10666500).

Almost surely, 2^42648779 is an apocalyptic number.

42648779 is a deficient number, since it is larger than the sum of its proper divisors (17221).

42648779 is a wasteful number, since it uses less digits than its factorization.

42648779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17220.

The product of its digits is 677376, while the sum is 47.

The square root of 42648779 is about 6530.6032646303. The cubic root of 42648779 is about 349.3833468308.

The spelling of 42648779 in words is "forty-two million, six hundred forty-eight thousand, seven hundred seventy-nine".