81839468 has 12 divisors (see below), whose sum is σ = 143357760. Its totient is φ = 40880112.

The previous prime is 81839467. The next prime is 81839477. The reversal of 81839468 is 86493818.

It is not an unprimeable number, because it can be changed into a prime (81839467) 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, 4988 + ... + 13731.

It is an arithmetic number, because the mean of its divisors is an integer number (11946480).

Almost surely, 2^81839468 is an apocalyptic number.

It is an amenable number.

81839468 is a deficient number, since it is larger than the sum of its proper divisors (61518292).

81839468 is a wasteful number, since it uses less digits than its factorization.

81839468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19816 (or 19814 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 81839468 is about 9046.5168987849. The cubic root of 81839468 is about 434.1644559274.

The spelling of 81839468 in words is "eighty-one million, eight hundred thirty-nine thousand, four hundred sixty-eight".