81352944 has 40 divisors (see below), whose sum is σ = 233514320. Its totient is φ = 27117504.

The previous prime is 81352919. The next prime is 81352967. The reversal of 81352944 is 44925318.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 81352899 and 81352908.

It is a congruent number.

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, 93727 + ... + 94590.

It is an arithmetic number, because the mean of its divisors is an integer number (5837858).

Almost surely, 2^81352944 is an apocalyptic number.

It is an amenable number.

81352944 is an abundant number, since it is smaller than the sum of its proper divisors (152161376).

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

81352944 is a wasteful number, since it uses less digits than its factorization.

81352944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188334 (or 188322 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81352944 is about 9019.5866867612. The cubic root of 81352944 is about 433.3023967395.

The spelling of 81352944 in words is "eighty-one million, three hundred fifty-two thousand, nine hundred forty-four".