81537282 has 48 divisors (see below), whose sum is σ = 179974080. Its totient is φ = 26676000.

The previous prime is 81537271. The next prime is 81537293. The reversal of 81537282 is 28273518.

It is an interprime number because it is at equal distance from previous prime (81537271) and next prime (81537293).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355944 + ... + 356172.

It is an arithmetic number, because the mean of its divisors is an integer number (3749460).

Almost surely, 2^81537282 is an apocalyptic number.

81537282 is an abundant number, since it is smaller than the sum of its proper divisors (98436798).

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

81537282 is a wasteful number, since it uses less digits than its factorization.

81537282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 516 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 81537282 is about 9029.7996655518. The cubic root of 81537282 is about 433.6294238065.

The spelling of 81537282 in words is "eighty-one million, five hundred thirty-seven thousand, two hundred eighty-two".