78930985 has 16 divisors (see below), whose sum is σ = 109468800. Its totient is φ = 53513856.

The previous prime is 78930961. The next prime is 78930989. The reversal of 78930985 is 58903987.

It is a cyclic number.

It is not a de Polignac number, because 78930985 - 2¹³ = 78922793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78930989) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9555 + ... + 15784.

It is an arithmetic number, because the mean of its divisors is an integer number (6841800).

Almost surely, 2^78930985 is an apocalyptic number.

It is an amenable number.

78930985 is a deficient number, since it is larger than the sum of its proper divisors (30537815).

78930985 is a wasteful number, since it uses less digits than its factorization.

78930985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25440.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 78930985 is about 8884.3111719480. The cubic root of 78930985 is about 428.9590559396.

The spelling of 78930985 in words is "seventy-eight million, nine hundred thirty thousand, nine hundred eighty-five".