1578899578 has 4 divisors (see below), whose sum is σ = 2368349370. Its totient is φ = 789449788.

The previous prime is 1578899549. The next prime is 1578899579. The reversal of 1578899578 is 8759988751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8759988751 = 12329 ⋅710519.

It can be written as a sum of positive squares in only one way, i.e., 1447269849 + 131629729 = 38043^2 + 11473^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1578899579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394724893 + ... + 394724896.

Almost surely, 2^1578899578 is an apocalyptic number.

1578899578 is a deficient number, since it is larger than the sum of its proper divisors (789449792).

1578899578 is an equidigital number, since it uses as much as digits as its factorization.

1578899578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789449791.

The product of its digits is 50803200, while the sum is 67.

The square root of 1578899578 is about 39735.3693577900. The cubic root of 1578899578 is about 1164.4428259070.

The spelling of 1578899578 in words is "one billion, five hundred seventy-eight million, eight hundred ninety-nine thousand, five hundred seventy-eight".