78778340 has 24 divisors (see below), whose sum is σ = 175166712. Its totient is φ = 29657600.

The previous prime is 78778309. The next prime is 78778363. The reversal of 78778340 is 4387787.

It can be written as a sum of positive squares in 4 ways, for example, as 10484644 + 68293696 = 3238^2 + 8264^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78778291 and 78778300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115511 + ... + 116190.

It is an arithmetic number, because the mean of its divisors is an integer number (7298613).

Almost surely, 2^78778340 is an apocalyptic number.

It is an amenable number.

78778340 is an abundant number, since it is smaller than the sum of its proper divisors (96388372).

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

78778340 is a wasteful number, since it uses less digits than its factorization.

78778340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231727 (or 231725 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 44.

The square root of 78778340 is about 8875.7163091212. The cubic root of 78778340 is about 428.6823555192.

The spelling of 78778340 in words is "seventy-eight million, seven hundred seventy-eight thousand, three hundred forty".