81671046 has 16 divisors (see below), whose sum is σ = 163512624. Its totient is φ = 27195264.

The previous prime is 81671041. The next prime is 81671059. The reversal of 81671046 is 64017618.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81670998 and 81671016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81671041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (10219539).

Almost surely, 2^81671046 is an apocalyptic number.

81671046 is an abundant number, since it is smaller than the sum of its proper divisors (81841578).

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

81671046 is a wasteful number, since it uses less digits than its factorization.

81671046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14215.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 81671046 is about 9037.2034391177. The cubic root of 81671046 is about 433.8664209800.

The spelling of 81671046 in words is "eighty-one million, six hundred seventy-one thousand, forty-six".