78778546 has 16 divisors (see below), whose sum is σ = 147326400. Its totient is φ = 30692880.

The previous prime is 78778543. The next prime is 78778549. The reversal of 78778546 is 64587787.

It is an interprime number because it is at equal distance from previous prime (78778543) and next prime (78778549).

It is a junction number, because it is equal to n+sod(n) for n = 78778493 and 78778502.

It is not an unprimeable number, because it can be changed into a prime (78778543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255621 + ... + 255928.

It is an arithmetic number, because the mean of its divisors is an integer number (9207900).

Almost surely, 2^78778546 is an apocalyptic number.

78778546 is a deficient number, since it is larger than the sum of its proper divisors (68547854).

78778546 is a wasteful number, since it uses less digits than its factorization.

78778546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511569.

The product of its digits is 2634240, while the sum is 52.

The square root of 78778546 is about 8875.7279138108. The cubic root of 78778546 is about 428.6827291772.

The spelling of 78778546 in words is "seventy-eight million, seven hundred seventy-eight thousand, five hundred forty-six".