81894962 has 16 divisors (see below), whose sum is σ = 128380032. Its totient is φ = 39142320.

The previous prime is 81894947. The next prime is 81894979. The reversal of 81894962 is 26949818.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6089 + ... + 14172.

It is an arithmetic number, because the mean of its divisors is an integer number (8023752).

Almost surely, 2^81894962 is an apocalyptic number.

81894962 is a deficient number, since it is larger than the sum of its proper divisors (46485070).

81894962 is a wasteful number, since it uses less digits than its factorization.

81894962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20353.

The product of its digits is 248832, while the sum is 47.

The square root of 81894962 is about 9049.5835263287. The cubic root of 81894962 is about 434.2625670187.

The spelling of 81894962 in words is "eighty-one million, eight hundred ninety-four thousand, nine hundred sixty-two".