42778773 has 20 divisors (see below), whose sum is σ = 64232608. Its totient is φ = 28372680.

The previous prime is 42778739. The next prime is 42778777. The reversal of 42778773 is 37787724.

It is not a de Polignac number, because 42778773 - 2⁸ = 42778517 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 (42778777) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15840 + ... + 18342.

Almost surely, 2^42778773 is an apocalyptic number.

It is an amenable number.

42778773 is a deficient number, since it is larger than the sum of its proper divisors (21453835).

42778773 is a wasteful number, since it uses less digits than its factorization.

42778773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726 (or 2717 counting only the distinct ones).

The product of its digits is 460992, while the sum is 45.

The square root of 42778773 is about 6540.5483715053. The cubic root of 42778773 is about 349.7379616890.

The spelling of 42778773 in words is "forty-two million, seven hundred seventy-eight thousand, seven hundred seventy-three".