81503382 has 8 divisors (see below), whose sum is σ = 163006776. Its totient is φ = 27167792.

The previous prime is 81503363. The next prime is 81503473. The reversal of 81503382 is 28330518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

81503382 is an admirable number.

It is a super-3 number, since 3×81503382³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6791943 + ... + 6791954.

It is an arithmetic number, because the mean of its divisors is an integer number (20375847).

Almost surely, 2^81503382 is an apocalyptic number.

81503382 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81503382 is a wasteful number, since it uses less digits than its factorization.

81503382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13583902.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 81503382 is about 9027.9223523466. The cubic root of 81503382 is about 433.5693201140.

The spelling of 81503382 in words is "eighty-one million, five hundred three thousand, three hundred eighty-two".