78122198 has 48 divisors (see below), whose sum is σ = 148925952. Its totient is φ = 30082800.

The previous prime is 78122197. The next prime is 78122203. The reversal of 78122198 is 89122187.

It is a super-2 number, since 2×78122198² = 12206155640702408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78122197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181043 + ... + 181473.

It is an arithmetic number, because the mean of its divisors is an integer number (3102624).

Almost surely, 2^78122198 is an apocalyptic number.

78122198 is a deficient number, since it is larger than the sum of its proper divisors (70803754).

78122198 is a wasteful number, since it uses less digits than its factorization.

78122198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 558 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 78122198 is about 8838.6762583545. The cubic root of 78122198 is about 427.4888758320.

The spelling of 78122198 in words is "seventy-eight million, one hundred twenty-two thousand, one hundred ninety-eight".