1578873861 has 24 divisors (see below), whose sum is σ = 2416938264. Its totient is φ = 989767680.

The previous prime is 1578873853. The next prime is 1578873911. The reversal of 1578873861 is 1683788751.

It is a happy number.

1578873861 is a `hidden beast` number, since 1 + 578 + 8 + 7 + 3 + 8 + 61 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 416404836 + 1162469025 = 20406^2 + 34095^2 .

It is not a de Polignac number, because 1578873861 - 2³ = 1578873853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1578873798 and 1578873807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1578873811) 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, 191341 + ... + 199421.

It is an arithmetic number, because the mean of its divisors is an integer number (100705761).

Almost surely, 2^1578873861 is an apocalyptic number.

It is an amenable number.

1578873861 is a deficient number, since it is larger than the sum of its proper divisors (838064403).

1578873861 is a wasteful number, since it uses less digits than its factorization.

1578873861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9381 (or 9378 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 1578873861 is about 39735.0457530880. The cubic root of 1578873861 is about 1164.4365037530.

The spelling of 1578873861 in words is "one billion, five hundred seventy-eight million, eight hundred seventy-three thousand, eight hundred sixty-one".