78928913 has 8 divisors (see below), whose sum is σ = 90290880. Its totient is φ = 67588560.

The previous prime is 78928873. The next prime is 78928919. The reversal of 78928913 is 31982987.

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

It is a cyclic number.

It is not a de Polignac number, because 78928913 - 2²² = 74734609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78928919) 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 7 ways as a sum of consecutive naturals, for example, 3383 + ... + 13011.

It is an arithmetic number, because the mean of its divisors is an integer number (11286360).

Almost surely, 2^78928913 is an apocalyptic number.

It is an amenable number.

78928913 is a deficient number, since it is larger than the sum of its proper divisors (11361967).

78928913 is a wasteful number, since it uses less digits than its factorization.

78928913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10807.

The product of its digits is 217728, while the sum is 47.

The square root of 78928913 is about 8884.1945611293. The cubic root of 78928913 is about 428.9553024033.

The spelling of 78928913 in words is "seventy-eight million, nine hundred twenty-eight thousand, nine hundred thirteen".