78479871 has 16 divisors (see below), whose sum is σ = 111007584. Its totient is φ = 49147904.

The previous prime is 78479857. The next prime is 78479881. The reversal of 78479871 is 17897487.

It is a cyclic number.

It is not a de Polignac number, because 78479871 - 2¹⁰ = 78478847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78479831) 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, 33391 + ... + 35663.

It is an arithmetic number, because the mean of its divisors is an integer number (6937974).

Almost surely, 2^78479871 is an apocalyptic number.

78479871 is a deficient number, since it is larger than the sum of its proper divisors (32527713).

78479871 is a wasteful number, since it uses less digits than its factorization.

78479871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970.

The product of its digits is 790272, while the sum is 51.

The square root of 78479871 is about 8858.8865553183. The cubic root of 78479871 is about 428.1402846835.

The spelling of 78479871 in words is "seventy-eight million, four hundred seventy-nine thousand, eight hundred seventy-one".