7800000078 has 32 divisors (see below), whose sum is σ = 17788238496. Its totient is φ = 2258823168.

The previous prime is 7800000017. The next prime is 7800000083. The reversal of 7800000078 is 8700000087.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2939851 + ... + 2942502.

It is an arithmetic number, because the mean of its divisors is an integer number (555882453).

Almost surely, 2^7800000078 is an apocalyptic number.

7800000078 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

7800000078 is an abundant number, since it is smaller than the sum of its proper divisors (9988238418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7800000078 is a wasteful number, since it uses less digits than its factorization.

7800000078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882388.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 7800000078 is about 88317.6091048665. The cubic root of 7800000078 is about 1983.1924892914.

Subtracting 7800000078 from its reverse (8700000087), we obtain a palindrome (900000009).

It can be divided in two parts, 78000000 and 78, that multiplied together give a square (6084000000 = 78000²).

The spelling of 7800000078 in words is "seven billion, eight hundred million, seventy-eight", and thus it is an aban number.