1578878073 has 6 divisors (see below), whose sum is σ = 2280601674. Its totient is φ = 1052585376.

The previous prime is 1578878071. The next prime is 1578878083. The reversal of 1578878073 is 3708788751.

It can be written as a sum of positive squares in only one way, i.e., 1405350144 + 173527929 = 37488^2 + 13173^2 .

It is not a de Polignac number, because 1578878073 - 2¹ = 1578878071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1578878071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87715440 + ... + 87715457.

It is an arithmetic number, because the mean of its divisors is an integer number (380100279).

Almost surely, 2^1578878073 is an apocalyptic number.

It is an amenable number.

1578878073 is a deficient number, since it is larger than the sum of its proper divisors (701723601).

1578878073 is a wasteful number, since it uses less digits than its factorization.

1578878073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175430903 (or 175430900 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 54.

The square root of 1578878073 is about 39735.0987541242. The cubic root of 1578878073 is about 1164.4375392172.

The spelling of 1578878073 in words is "one billion, five hundred seventy-eight million, eight hundred seventy-eight thousand, seventy-three".