8242487978 has 8 divisors (see below), whose sum is σ = 13091010372. Its totient is φ = 3878817856.

The previous prime is 8242487969. The next prime is 8242487999. The reversal of 8242487978 is 8797842428.

It can be written as a sum of positive squares in 2 ways, for example, as 7973954209 + 268533769 = 89297^2 + 16387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 121213025 + ... + 121213092.

Almost surely, 2^8242487978 is an apocalyptic number.

8242487978 is a deficient number, since it is larger than the sum of its proper divisors (4848522394).

8242487978 is a wasteful number, since it uses less digits than its factorization.

8242487978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242426136.

The product of its digits is 14450688, while the sum is 59.

The square root of 8242487978 is about 90788.1488851932. The cubic root of 8242487978 is about 2020.0065334887.

The spelling of 8242487978 in words is "eight billion, two hundred forty-two million, four hundred eighty-seven thousand, nine hundred seventy-eight".