78851913 has 16 divisors (see below), whose sum is σ = 121076736. Its totient is φ = 44712720.

The previous prime is 78851893. The next prime is 78851917. The reversal of 78851913 is 31915887.

It is not a de Polignac number, because 78851913 - 2⁶ = 78851849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78851917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11581 + ... + 17082.

It is an arithmetic number, because the mean of its divisors is an integer number (7567296).

Almost surely, 2^78851913 is an apocalyptic number.

It is an amenable number.

78851913 is a deficient number, since it is larger than the sum of its proper divisors (42224823).

78851913 is a wasteful number, since it uses less digits than its factorization.

78851913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28804.

The product of its digits is 60480, while the sum is 42.

The square root of 78851913 is about 8879.8599651121. The cubic root of 78851913 is about 428.8157662746.

The spelling of 78851913 in words is "seventy-eight million, eight hundred fifty-one thousand, nine hundred thirteen".