81708052 has 48 divisors (see below), whose sum is σ = 160030080. Its totient is φ = 36303872.

The previous prime is 81707987. The next prime is 81708059. The reversal of 81708052 is 25080718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81708059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138903 + ... + 139489.

It is an arithmetic number, because the mean of its divisors is an integer number (3333960).

Almost surely, 2^81708052 is an apocalyptic number.

It is an amenable number.

81708052 is a deficient number, since it is larger than the sum of its proper divisors (78322028).

81708052 is a wasteful number, since it uses less digits than its factorization.

81708052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 81708052 is about 9039.2506326576. The cubic root of 81708052 is about 433.9319408804.

The spelling of 81708052 in words is "eighty-one million, seven hundred eight thousand, fifty-two".