81940552 has 32 divisors (see below), whose sum is σ = 157593600. Its totient is φ = 39923584.

The previous prime is 81940549. The next prime is 81940553. The reversal of 81940552 is 25504918.

It is not an unprimeable number, because it can be changed into a prime (81940553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143724 + ... + 144292.

It is an arithmetic number, because the mean of its divisors is an integer number (4924800).

Almost surely, 2^81940552 is an apocalyptic number.

It is an amenable number.

81940552 is a deficient number, since it is larger than the sum of its proper divisors (75653048).

81940552 is a wasteful number, since it uses less digits than its factorization.

81940552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005 (or 1001 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 81940552 is about 9052.1020763135. The cubic root of 81940552 is about 434.3431350916.

The spelling of 81940552 in words is "eighty-one million, nine hundred forty thousand, five hundred fifty-two".