78122 has 16 divisors (see below), whose sum is σ = 132192. Its totient is φ = 34320.

The previous prime is 78121. The next prime is 78137. The reversal of 78122 is 22187.

It is a super-2 number, since 2×78122² = 12206093768, which contains 22 as substring.

It is a nialpdrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 78094 and 78103.

It is not an unprimeable number, because it can be changed into a prime (78121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (8262).

2⁷⁸¹²² is an apocalyptic number.

78122 is a deficient number, since it is larger than the sum of its proper divisors (54070).

78122 is a wasteful number, since it uses less digits than its factorization.

78122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133.

The product of its digits is 224, while the sum is 20.

The square root of 78122 is about 279.5031305728. The cubic root of 78122 is about 42.7488514676.

The spelling of 78122 in words is "seventy-eight thousand, one hundred twenty-two".