78180655 has 16 divisors (see below), whose sum is σ = 107449344. Its totient is φ = 53494560.

The previous prime is 78180653. The next prime is 78180659. The reversal of 78180655 is 55608187.

It is not a de Polignac number, because 78180655 - 2¹ = 78180653 is a prime.

It is a super-2 number, since 2×78180655² = 12224429632458050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78180653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16170 + ... + 20440.

It is an arithmetic number, because the mean of its divisors is an integer number (6715584).

Almost surely, 2^78180655 is an apocalyptic number.

78180655 is a deficient number, since it is larger than the sum of its proper divisors (29268689).

78180655 is a wasteful number, since it uses less digits than its factorization.

78180655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 78180655 is about 8841.9825265604. The cubic root of 78180655 is about 427.5954758653.

The spelling of 78180655 in words is "seventy-eight million, one hundred eighty thousand, six hundred fifty-five".