78222042 has 12 divisors (see below), whose sum is σ = 169481130. Its totient is φ = 26074008.

The previous prime is 78222007. The next prime is 78222043. The reversal of 78222042 is 24022287.

It can be written as a sum of positive squares in only one way, i.e., 64979721 + 13242321 = 8061^2 + 3639^2 .

It is a super-2 number, since 2×78222042² = 12237375709299528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78221997 and 78222015.

It is not an unprimeable number, because it can be changed into a prime (78222043) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 2172817 + ... + 2172852.

Almost surely, 2^78222042 is an apocalyptic number.

78222042 is an abundant number, since it is smaller than the sum of its proper divisors (91259088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78222042 is a wasteful number, since it uses less digits than its factorization.

78222042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345677 (or 4345674 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 78222042 is about 8844.3225857043. The cubic root of 78222042 is about 427.6709155509.

The spelling of 78222042 in words is "seventy-eight million, two hundred twenty-two thousand, forty-two".