78122188 has 12 divisors (see below), whose sum is σ = 136779160. Its totient is φ = 39042432.

The previous prime is 78122183. The next prime is 78122197. The reversal of 78122188 is 88122187.

It is a super-2 number, since 2×78122188² = 12206152515814688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78122183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9595 + ... + 15757.

Almost surely, 2^78122188 is an apocalyptic number.

It is an amenable number.

78122188 is a deficient number, since it is larger than the sum of its proper divisors (58656972).

78122188 is a wasteful number, since it uses less digits than its factorization.

78122188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9336 (or 9334 counting only the distinct ones).

The product of its digits is 14336, while the sum is 37.

The square root of 78122188 is about 8838.6756926589. The cubic root of 78122188 is about 427.4888575918.

Subtracting 78122188 from its reverse (88122187), we obtain a palindrome (9999999).

It can be divided in two parts, 7812 and 2188, that added together give a 4-th power (10000 = 10⁴).

The spelling of 78122188 in words is "seventy-eight million, one hundred twenty-two thousand, one hundred eighty-eight".