78118655 has 32 divisors (see below), whose sum is σ = 103913280. Its totient is φ = 56125440.

The previous prime is 78118619. The next prime is 78118657. The reversal of 78118655 is 55681187.

It is not a de Polignac number, because 78118655 - 2¹⁸ = 77856511 is a prime.

It is a super-2 number, since 2×78118655² = 12205048518018050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78118657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185345 + ... + 185765.

It is an arithmetic number, because the mean of its divisors is an integer number (3247290).

Almost surely, 2^78118655 is an apocalyptic number.

78118655 is a deficient number, since it is larger than the sum of its proper divisors (25794625).

78118655 is a wasteful number, since it uses less digits than its factorization.

78118655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its digits is 67200, while the sum is 41.

The square root of 78118655 is about 8838.4758301418. The cubic root of 78118655 is about 427.4824132386.

The spelling of 78118655 in words is "seventy-eight million, one hundred eighteen thousand, six hundred fifty-five".