81534036 has 12 divisors (see below), whose sum is σ = 190246112. Its totient is φ = 27178008.

The previous prime is 81534031. The next prime is 81534041. The reversal of 81534036 is 63043518.

It is an interprime number because it is at equal distance from previous prime (81534031) and next prime (81534041).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 81533994 and 81534012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81534031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3397240 + ... + 3397263.

Almost surely, 2^81534036 is an apocalyptic number.

It is an amenable number.

81534036 is an abundant number, since it is smaller than the sum of its proper divisors (108712076).

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

81534036 is a wasteful number, since it uses less digits than its factorization.

81534036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6794510 (or 6794508 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 81534036 is about 9029.6199255561. The cubic root of 81534036 is about 433.6236694663.

The spelling of 81534036 in words is "eighty-one million, five hundred thirty-four thousand, thirty-six".