840802774357 has 54 divisors (see below), whose sum is σ = 1077595157058. Its totient is φ = 650253981888.

The previous prime is 840802774249. The next prime is 840802774367. The reversal of 840802774357 is 753477208048.

It can be written as a sum of positive squares in 3 ways, for example, as 89831478961 + 750971295396 = 299719^2 + 866586^2 .

It is not a de Polignac number, because 840802774357 - 2¹¹ = 840802772309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840802774298 and 840802774307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840802774367) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1087713423 + ... + 1087714195.

Almost surely, 2^840802774357 is an apocalyptic number.

It is an amenable number.

840802774357 is a deficient number, since it is larger than the sum of its proper divisors (236792382701).

840802774357 is an frugal number, since it uses more digits than its factorization.

840802774357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 10536960, while the sum is 55.

The spelling of 840802774357 in words is "eight hundred forty billion, eight hundred two million, seven hundred seventy-four thousand, three hundred fifty-seven".