78778071 has 6 divisors (see below), whose sum is σ = 113790560. Its totient is φ = 52518708.

The previous prime is 78778057. The next prime is 78778103. The reversal of 78778071 is 17087787.

It is not a de Polignac number, because 78778071 - 2¹¹ = 78776023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78778571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4376551 + ... + 4376568.

Almost surely, 2^78778071 is an apocalyptic number.

78778071 is a deficient number, since it is larger than the sum of its proper divisors (35012489).

78778071 is a wasteful number, since it uses less digits than its factorization.

78778071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8753125 (or 8753122 counting only the distinct ones).

The product of its (nonzero) digits is 153664, while the sum is 45.

The square root of 78778071 is about 8875.7011554018. The cubic root of 78778071 is about 428.6818675860.

The spelling of 78778071 in words is "seventy-eight million, seven hundred seventy-eight thousand, seventy-one".