81447834 has 32 divisors (see below), whose sum is σ = 181480320. Its totient is φ = 24196032.

The previous prime is 81447811. The next prime is 81447857. The reversal of 81447834 is 43874418.

It is an interprime number because it is at equal distance from previous prime (81447811) and next prime (81447857).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 81447792 and 81447801.

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, 15742 + ... + 20265.

It is an arithmetic number, because the mean of its divisors is an integer number (5671260).

Almost surely, 2^81447834 is an apocalyptic number.

81447834 is an abundant number, since it is smaller than the sum of its proper divisors (100032486).

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

81447834 is a wasteful number, since it uses less digits than its factorization.

81447834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36054.

The product of its digits is 86016, while the sum is 39.

The square root of 81447834 is about 9024.8453726366. The cubic root of 81447834 is about 433.4707991223.

The spelling of 81447834 in words is "eighty-one million, four hundred forty-seven thousand, eight hundred thirty-four".