78111122 has 4 divisors (see below), whose sum is σ = 117166686. Its totient is φ = 39055560.

The previous prime is 78111119. The next prime is 78111139. The reversal of 78111122 is 22111187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48288601 + 29822521 = 6949^2 + 5461^2 .

It is a super-2 number, since 2×78111122² = 12202694760197768, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19527779 + ... + 19527782.

Almost surely, 2^78111122 is an apocalyptic number.

78111122 is a deficient number, since it is larger than the sum of its proper divisors (39055564).

78111122 is a wasteful number, since it uses less digits than its factorization.

78111122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39055563.

The product of its digits is 224, while the sum is 23.

The square root of 78111122 is about 8838.0496717319. The cubic root of 78111122 is about 427.4686720542.

The spelling of 78111122 in words is "seventy-eight million, one hundred eleven thousand, one hundred twenty-two".