81437814 has 24 divisors (see below), whose sum is σ = 181218960. Its totient is φ = 26412048.

The previous prime is 81437809. The next prime is 81437821. The reversal of 81437814 is 41873418.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60474 + ... + 61805.

It is an arithmetic number, because the mean of its divisors is an integer number (7550790).

Almost surely, 2^81437814 is an apocalyptic number.

81437814 is an abundant number, since it is smaller than the sum of its proper divisors (99781146).

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

81437814 is a wasteful number, since it uses less digits than its factorization.

81437814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122324 (or 122321 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 81437814 is about 9024.2902213969. The cubic root of 81437814 is about 433.4530226908.

The spelling of 81437814 in words is "eighty-one million, four hundred thirty-seven thousand, eight hundred fourteen".