842778351 has 20 divisors (see below), whose sum is σ = 1313705712. Its totient is φ = 537422688.

The previous prime is 842778289. The next prime is 842778353. The reversal of 842778351 is 153877248.

It is not a de Polignac number, because 842778351 - 2²⁷ = 708560623 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 842778297 and 842778306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842778353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 224326 + ... + 228051.

Almost surely, 2^842778351 is an apocalyptic number.

842778351 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

842778351 is a deficient number, since it is larger than the sum of its proper divisors (470927361).

842778351 is a wasteful number, since it uses less digits than its factorization.

842778351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452412 (or 452403 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 842778351 is about 29030.6450324480. The cubic root of 842778351 is about 944.5779218649.

The spelling of 842778351 in words is "eight hundred forty-two million, seven hundred seventy-eight thousand, three hundred fifty-one".