81246036 has 48 divisors (see below), whose sum is σ = 193001984. Its totient is φ = 26597376.

The previous prime is 81246031. The next prime is 81246037. The reversal of 81246036 is 63064218.

It is a junction number, because it is equal to n+sod(n) for n = 81245994 and 81246012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81246031) 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, 259416 + ... + 259728.

Almost surely, 2^81246036 is an apocalyptic number.

It is an amenable number.

81246036 is an abundant number, since it is smaller than the sum of its proper divisors (111755948).

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

81246036 is a wasteful number, since it uses less digits than its factorization.

81246036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 81246036 is about 9013.6583028202. The cubic root of 81246036 is about 433.1125089214.

The spelling of 81246036 in words is "eighty-one million, two hundred forty-six thousand, thirty-six".