81542552 has 64 divisors (see below), whose sum is σ = 190209600. Its totient is φ = 31910400.

The previous prime is 81542507. The next prime is 81542581. The reversal of 81542552 is 25524518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72974 + ... + 74082.

It is an arithmetic number, because the mean of its divisors is an integer number (2972025).

Almost surely, 2^81542552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81542552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95104800).

81542552 is an abundant number, since it is smaller than the sum of its proper divisors (108667048).

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

81542552 is a wasteful number, since it uses less digits than its factorization.

81542552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1232 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

The square root of 81542552 is about 9030.0914724049. The cubic root of 81542552 is about 433.6387658636.

The spelling of 81542552 in words is "eighty-one million, five hundred forty-two thousand, five hundred fifty-two".