857678445 has 24 divisors (see below), whose sum is σ = 1601000856. Its totient is φ = 422241408.

The previous prime is 857678443. The next prime is 857678447. The reversal of 857678445 is 544876758.

It is an interprime number because it is at equal distance from previous prime (857678443) and next prime (857678447).

It can be written as a sum of positive squares in 4 ways, for example, as 124947684 + 732730761 = 11178^2 + 27069^2 .

It is not a de Polignac number, because 857678445 - 2¹ = 857678443 is a prime.

It is a super-2 number, since 2×857678445² = 1471224630035236050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 857678391 and 857678400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857678443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 732474 + ... + 733643.

It is an arithmetic number, because the mean of its divisors is an integer number (66708369).

Almost surely, 2^857678445 is an apocalyptic number.

It is an amenable number.

857678445 is a deficient number, since it is larger than the sum of its proper divisors (743322411).

857678445 is a wasteful number, since it uses less digits than its factorization.

857678445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466141 (or 1466138 counting only the distinct ones).

The product of its digits is 7526400, while the sum is 54.

The square root of 857678445 is about 29286.1476640408. The cubic root of 857678445 is about 950.1120624961.

The spelling of 857678445 in words is "eight hundred fifty-seven million, six hundred seventy-eight thousand, four hundred forty-five".