78650978 has 24 divisors (see below), whose sum is σ = 138988800. Its totient is φ = 33277608.

The previous prime is 78650963. The next prime is 78650981. The reversal of 78650978 is 87905687.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2663 + ... + 12821.

It is an arithmetic number, because the mean of its divisors is an integer number (5791200).

Almost surely, 2^78650978 is an apocalyptic number.

78650978 is a deficient number, since it is larger than the sum of its proper divisors (60337822).

78650978 is a wasteful number, since it uses less digits than its factorization.

78650978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10254 (or 10247 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 78650978 is about 8868.5386620345. The cubic root of 78650978 is about 428.4512120702.

The spelling of 78650978 in words is "seventy-eight million, six hundred fifty thousand, nine hundred seventy-eight".