81436746 has 8 divisors (see below), whose sum is σ = 162873504. Its totient is φ = 27145580.

The previous prime is 81436723. The next prime is 81436753. The reversal of 81436746 is 64763418.

It is a sphenic number, since it is the product of 3 distinct primes.

81436746 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6786390 + ... + 6786401.

It is an arithmetic number, because the mean of its divisors is an integer number (20359188).

Almost surely, 2^81436746 is an apocalyptic number.

81436746 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81436746 is a wasteful number, since it uses less digits than its factorization.

81436746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13572796.

The product of its digits is 96768, while the sum is 39.

The square root of 81436746 is about 9024.2310475741. The cubic root of 81436746 is about 433.4511278714.

The spelling of 81436746 in words is "eighty-one million, four hundred thirty-six thousand, seven hundred forty-six".