78286706 has 4 divisors (see below), whose sum is σ = 117430062. Its totient is φ = 39143352.

The previous prime is 78286693. The next prime is 78286721. The reversal of 78286706 is 60768287.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60768287 = 463 ⋅131249.

It can be written as a sum of positive squares in only one way, i.e., 75255625 + 3031081 = 8675^2 + 1741^2 .

It is a super-2 number, since 2×78286706² = 12257616672660872, 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, 19571675 + ... + 19571678.

Almost surely, 2^78286706 is an apocalyptic number.

78286706 is a deficient number, since it is larger than the sum of its proper divisors (39143356).

78286706 is a wasteful number, since it uses less digits than its factorization.

78286706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39143355.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 78286706 is about 8847.9775090130. The cubic root of 78286706 is about 427.7887310002.

The spelling of 78286706 in words is "seventy-eight million, two hundred eighty-six thousand, seven hundred six".