78890766 has 8 divisors (see below), whose sum is σ = 157781544. Its totient is φ = 26296920.

The previous prime is 78890741. The next prime is 78890809. The reversal of 78890766 is 66709887.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

78890766 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6574225 + ... + 6574236.

It is an arithmetic number, because the mean of its divisors is an integer number (19722693).

Almost surely, 2^78890766 is an apocalyptic number.

78890766 is the 5618-th centered pentagonal number.

78890766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78890766 is a wasteful number, since it uses less digits than its factorization.

78890766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13148466.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The square root of 78890766 is about 8882.0473991079. The cubic root of 78890766 is about 428.8861853789.

The spelling of 78890766 in words is "seventy-eight million, eight hundred ninety thousand, seven hundred sixty-six".