78221122 has 16 divisors (see below), whose sum is σ = 138419712. Its totient is φ = 32441760.

The previous prime is 78221089. The next prime is 78221159. The reversal of 78221122 is 22112287.

It is a super-2 number, since 2×78221122² = 12237087853877768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89683 + ... + 90550.

It is an arithmetic number, because the mean of its divisors is an integer number (8651232).

Almost surely, 2^78221122 is an apocalyptic number.

78221122 is a deficient number, since it is larger than the sum of its proper divisors (60198590).

78221122 is a wasteful number, since it uses less digits than its factorization.

78221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180273.

The product of its digits is 896, while the sum is 25.

The square root of 78221122 is about 8844.2705747846. The cubic root of 78221122 is about 427.6692388761.

It can be divided in two parts, 782 and 21122, that added together give a square (21904 = 148²).

The spelling of 78221122 in words is "seventy-eight million, two hundred twenty-one thousand, one hundred twenty-two".