78122722 has 4 divisors (see below), whose sum is σ = 117184086. Its totient is φ = 39061360.

The previous prime is 78122717. The next prime is 78122741. The reversal of 78122722 is 22722187.

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., 77986561 + 136161 = 8831^2 + 369^2 .

It is a super-2 number, since 2×78122722² = 12206319385378568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19530679 + ... + 19530682.

Almost surely, 2^78122722 is an apocalyptic number.

78122722 is a deficient number, since it is larger than the sum of its proper divisors (39061364).

78122722 is a wasteful number, since it uses less digits than its factorization.

78122722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39061363.

The product of its digits is 6272, while the sum is 31.

The square root of 78122722 is about 8838.7059007527. The cubic root of 78122722 is about 427.4898316152.

The spelling of 78122722 in words is "seventy-eight million, one hundred twenty-two thousand, seven hundred twenty-two".