42778634 has 4 divisors (see below), whose sum is σ = 64167954. Its totient is φ = 21389316.

The previous prime is 42778627. The next prime is 42778663. The reversal of 42778634 is 43687724.

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

It can be written as a sum of positive squares in only one way, i.e., 40360609 + 2418025 = 6353^2 + 1555^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42778591 and 42778600.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694657 + ... + 10694660.

Almost surely, 2^42778634 is an apocalyptic number.

42778634 is a deficient number, since it is larger than the sum of its proper divisors (21389320).

42778634 is a wasteful number, since it uses less digits than its factorization.

42778634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21389319.

The product of its digits is 225792, while the sum is 41.

The square root of 42778634 is about 6540.5377454763. The cubic root of 42778634 is about 349.7375828903.

The spelling of 42778634 in words is "forty-two million, seven hundred seventy-eight thousand, six hundred thirty-four".