81347854 has 32 divisors (see below), whose sum is σ = 150393600. Its totient is φ = 32218560.

The previous prime is 81347821. The next prime is 81347857. The reversal of 81347854 is 45874318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81347857) 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, 7177 + ... + 14635.

It is an arithmetic number, because the mean of its divisors is an integer number (4699800).

Almost surely, 2^81347854 is an apocalyptic number.

81347854 is a deficient number, since it is larger than the sum of its proper divisors (69045746).

81347854 is a wasteful number, since it uses less digits than its factorization.

81347854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528.

The product of its digits is 107520, while the sum is 40.

The square root of 81347854 is about 9019.3045186422. The cubic root of 81347854 is about 433.2933597578.

The spelling of 81347854 in words is "eighty-one million, three hundred forty-seven thousand, eight hundred fifty-four".