78055775 has 18 divisors (see below), whose sum is σ = 112593240. Its totient is φ = 53523120.

The previous prime is 78055771. The next prime is 78055787. The reversal of 78055775 is 57755087.

It is not a de Polignac number, because 78055775 - 2² = 78055771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78055771) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 30635 + ... + 33084.

It is an arithmetic number, because the mean of its divisors is an integer number (6255180).

Almost surely, 2^78055775 is an apocalyptic number.

78055775 is a deficient number, since it is larger than the sum of its proper divisors (34537465).

78055775 is a wasteful number, since it uses less digits than its factorization.

78055775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63743 (or 63731 counting only the distinct ones).

The product of its (nonzero) digits is 343000, while the sum is 44.

The square root of 78055775 is about 8834.9179396302. The cubic root of 78055775 is about 427.3676847334.

The spelling of 78055775 in words is "seventy-eight million, fifty-five thousand, seven hundred seventy-five".