78909668 has 12 divisors (see below), whose sum is σ = 140432880. Its totient is φ = 38785992.

The previous prime is 78909659. The next prime is 78909683. The reversal of 78909668 is 86690987.

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, 166946 + ... + 167417.

It is an arithmetic number, because the mean of its divisors is an integer number (11702740).

Almost surely, 2^78909668 is an apocalyptic number.

It is an amenable number.

78909668 is a deficient number, since it is larger than the sum of its proper divisors (61523212).

78909668 is a wasteful number, since it uses less digits than its factorization.

78909668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334426 (or 334424 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 78909668 is about 8883.1113918491. Note that the first 3 decimals coincide. The cubic root of 78909668 is about 428.9204359413.

The spelling of 78909668 in words is "seventy-eight million, nine hundred nine thousand, six hundred sixty-eight".