78229706 has 4 divisors (see below), whose sum is σ = 117344562. Its totient is φ = 39114852.

The previous prime is 78229703. The next prime is 78229747. The reversal of 78229706 is 60792287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60792287 = 1753 ⋅34679.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 12538681 = 8105^2 + 3541^2 .

It is a super-2 number, since 2×78229706² = 12239773801692872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78229703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19557425 + ... + 19557428.

Almost surely, 2^78229706 is an apocalyptic number.

78229706 is a deficient number, since it is larger than the sum of its proper divisors (39114856).

78229706 is a wasteful number, since it uses less digits than its factorization.

78229706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39114855.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 78229706 is about 8844.7558473934. The cubic root of 78229706 is about 427.6848824703.

The spelling of 78229706 in words is "seventy-eight million, two hundred twenty-nine thousand, seven hundred six".