81694548 has 96 divisors (see below), whose sum is σ = 235576320. Its totient is φ = 24312960.

The previous prime is 81694541. The next prime is 81694549. The reversal of 81694548 is 84549618.

81694548 is a `hidden beast` number, since 8 + 16 + 94 + 548 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81694541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42586 + ... + 44462.

It is an arithmetic number, because the mean of its divisors is an integer number (2453920).

Almost surely, 2^81694548 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81694548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117788160).

81694548 is an abundant number, since it is smaller than the sum of its proper divisors (153881772).

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

81694548 is a wasteful number, since it uses less digits than its factorization.

81694548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934 (or 1926 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 81694548 is about 9038.5036372178. The cubic root of 81694548 is about 433.9080340575.

The spelling of 81694548 in words is "eighty-one million, six hundred ninety-four thousand, five hundred forty-eight".