78118278 has 32 divisors (see below), whose sum is σ = 179854080. Its totient is φ = 22157280.

The previous prime is 78118273. The next prime is 78118283. The reversal of 78118278 is 87281187.

It is an interprime number because it is at equal distance from previous prime (78118273) and next prime (78118283).

It is a super-2 number, since 2×78118278² = 12204930715370568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78118273) 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, 853 + ... + 12528.

It is an arithmetic number, because the mean of its divisors is an integer number (5620440).

Almost surely, 2^78118278 is an apocalyptic number.

78118278 is an abundant number, since it is smaller than the sum of its proper divisors (101735802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78118278 is a wasteful number, since it uses less digits than its factorization.

78118278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13532.

The product of its digits is 50176, while the sum is 42.

The square root of 78118278 is about 8838.4545029094. The cubic root of 78118278 is about 427.4817255620.

The spelling of 78118278 in words is "seventy-eight million, one hundred eighteen thousand, two hundred seventy-eight".