1878085649 has 12 divisors (see below), whose sum is σ = 2066428980. Its totient is φ = 1705624800.

The previous prime is 1878085633. The next prime is 1878085709. The reversal of 1878085649 is 9465808781.

It can be written as a sum of positive squares in 2 ways, for example, as 763527424 + 1114558225 = 27632^2 + 33385^2 .

It is not a de Polignac number, because 1878085649 - 2⁴ = 1878085633 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1878085594 and 1878085603.

It is not an unprimeable number, because it can be changed into a prime (1878085049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121067 + ... + 135695.

It is an arithmetic number, because the mean of its divisors is an integer number (172202415).

Almost surely, 2^1878085649 is an apocalyptic number.

It is an amenable number.

1878085649 is a deficient number, since it is larger than the sum of its proper divisors (188343331).

1878085649 is a wasteful number, since it uses less digits than its factorization.

1878085649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15712 (or 15701 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 56.

The square root of 1878085649 is about 43336.8855479948. The cubic root of 1878085649 is about 1233.7820988690.

The spelling of 1878085649 in words is "one billion, eight hundred seventy-eight million, eighty-five thousand, six hundred forty-nine".