78778785 has 8 divisors (see below), whose sum is σ = 126046080. Its totient is φ = 42015344.

The previous prime is 78778669. The next prime is 78778787. The reversal of 78778785 is 58787787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78778785 - 2²⁶ = 11669921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78778787) 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, 2625945 + ... + 2625974.

It is an arithmetic number, because the mean of its divisors is an integer number (15755760).

Almost surely, 2^78778785 is an apocalyptic number.

It is an amenable number.

78778785 is a deficient number, since it is larger than the sum of its proper divisors (47267295).

78778785 is a wasteful number, since it uses less digits than its factorization.

78778785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251927.

The product of its digits is 6146560, while the sum is 57.

The square root of 78778785 is about 8875.7413774850. The cubic root of 78778785 is about 428.6831626923.

The spelling of 78778785 in words is "seventy-eight million, seven hundred seventy-eight thousand, seven hundred eighty-five".