81894646 has 8 divisors (see below), whose sum is σ = 125159904. Its totient is φ = 40174680.

The previous prime is 81894641. The next prime is 81894647. The reversal of 81894646 is 64649818.

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

It is a junction number, because it is equal to n+sod(n) for n = 81894596 and 81894605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81894641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386190 + ... + 386401.

It is an arithmetic number, because the mean of its divisors is an integer number (15644988).

Almost surely, 2^81894646 is an apocalyptic number.

81894646 is a deficient number, since it is larger than the sum of its proper divisors (43265258).

81894646 is a wasteful number, since it uses less digits than its factorization.

81894646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772646.

The product of its digits is 331776, while the sum is 46.

The square root of 81894646 is about 9049.5660669449. The cubic root of 81894646 is about 434.2620084693.

The spelling of 81894646 in words is "eighty-one million, eight hundred ninety-four thousand, six hundred forty-six".