78571881 has 12 divisors (see below), whose sum is σ = 113906052. Its totient is φ = 52190496.

The previous prime is 78571877. The next prime is 78571903. The reversal of 78571881 is 18817587.

78571881 is a `hidden beast` number, since 78 + 571 + 8 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11594025 + 66977856 = 3405^2 + 8184^2 .

It is not a de Polignac number, because 78571881 - 2² = 78571877 is a prime.

It is a super-2 number, since 2×78571881² = 12347080967756322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78571481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13266 + ... + 18251.

It is an arithmetic number, because the mean of its divisors is an integer number (9492171).

Almost surely, 2^78571881 is an apocalyptic number.

It is an amenable number.

78571881 is a deficient number, since it is larger than the sum of its proper divisors (35334171).

78571881 is a wasteful number, since it uses less digits than its factorization.

78571881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31800 (or 31797 counting only the distinct ones).

The product of its digits is 125440, while the sum is 45.

The square root of 78571881 is about 8864.0781246557. The cubic root of 78571881 is about 428.3075369238.

The spelling of 78571881 in words is "seventy-eight million, five hundred seventy-one thousand, eight hundred eighty-one".