7798438978 has 32 divisors (see below), whose sum is σ = 13110273792. Its totient is φ = 3448410000.

The previous prime is 7798438969. The next prime is 7798438987. The reversal of 7798438978 is 8798348977.

It is an interprime number because it is at equal distance from previous prime (7798438969) and next prime (7798438987).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221025 + ... + 253867.

It is an arithmetic number, because the mean of its divisors is an integer number (409696056).

Almost surely, 2^7798438978 is an apocalyptic number.

7798438978 is a deficient number, since it is larger than the sum of its proper divisors (5311834814).

7798438978 is a wasteful number, since it uses less digits than its factorization.

7798438978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33150.

The product of its digits is 170698752, while the sum is 70.

The square root of 7798438978 is about 88308.7706742654. The cubic root of 7798438978 is about 1983.0601744055.

Subtracting 7798438978 from its reverse (8798348977), we obtain a palindrome (999909999).

The spelling of 7798438978 in words is "seven billion, seven hundred ninety-eight million, four hundred thirty-eight thousand, nine hundred seventy-eight".