78006766 has 4 divisors (see below), whose sum is σ = 117010152. Its totient is φ = 39003382.

The previous prime is 78006763. The next prime is 78006811. The reversal of 78006766 is 66760087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66760087 = 167 ⋅399761.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78006763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19501690 + ... + 19501693.

It is an arithmetic number, because the mean of its divisors is an integer number (29252538).

Almost surely, 2^78006766 is an apocalyptic number.

78006766 is a deficient number, since it is larger than the sum of its proper divisors (39003386).

78006766 is a wasteful number, since it uses less digits than its factorization.

78006766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39003385.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 78006766 is about 8832.1439073421. The cubic root of 78006766 is about 427.2782220043.

The spelling of 78006766 in words is "seventy-eight million, six thousand, seven hundred sixty-six".