81520082 has 16 divisors (see below), whose sum is σ = 139879872. Its totient is φ = 34904400.

The previous prime is 81520079. The next prime is 81520091. The reversal of 81520082 is 28002518.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18308 + ... + 22320.

It is an arithmetic number, because the mean of its divisors is an integer number (8742492).

Almost surely, 2^81520082 is an apocalyptic number.

81520082 is a deficient number, since it is larger than the sum of its proper divisors (58359790).

81520082 is a wasteful number, since it uses less digits than its factorization.

81520082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5473.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 81520082 is about 9028.8472132382. The cubic root of 81520082 is about 433.5989308001.

The spelling of 81520082 in words is "eighty-one million, five hundred twenty thousand, eighty-two".