81871614 has 32 divisors (see below), whose sum is σ = 198478080. Its totient is φ = 24809400.

The previous prime is 81871607. The next prime is 81871631. The reversal of 81871614 is 41617818.

It is a super-2 number, since 2×81871614² = 13405922357929992, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68322 + ... + 69509.

It is an arithmetic number, because the mean of its divisors is an integer number (6202440).

Almost surely, 2^81871614 is an apocalyptic number.

81871614 is an abundant number, since it is smaller than the sum of its proper divisors (116606466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81871614 is a wasteful number, since it uses less digits than its factorization.

81871614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137853 (or 137847 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 81871614 is about 9048.2934302552. The cubic root of 81871614 is about 434.2212941253.

It can be divided in two parts, 8187 and 1614, that added together give a square (9801 = 99²).

The spelling of 81871614 in words is "eighty-one million, eight hundred seventy-one thousand, six hundred fourteen".