78163282 has 4 divisors (see below), whose sum is σ = 117244926. Its totient is φ = 39081640.

The previous prime is 78163249. The next prime is 78163313. The reversal of 78163282 is 28236187.

It is a Cunningham number, because it is equal to 8841²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28236187 = 7 ⋅4033741.

It can be written as a sum of positive squares in only one way, i.e., 78163281 + 1 = 8841^2 + 1^2 .

It is a super-2 number, since 2×78163282² = 12218997306023048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19540819 + ... + 19540822.

Almost surely, 2^78163282 is an apocalyptic number.

78163282 is a deficient number, since it is larger than the sum of its proper divisors (39081644).

78163282 is a wasteful number, since it uses less digits than its factorization.

78163282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39081643.

The product of its digits is 32256, while the sum is 37.

The square root of 78163282 is about 8841.0000565547. Note that the first 4 decimals coincide. The cubic root of 78163282 is about 427.5638006530.

The spelling of 78163282 in words is "seventy-eight million, one hundred sixty-three thousand, two hundred eighty-two".