81403326 has 16 divisors (see below), whose sum is σ = 180896400. Its totient is φ = 27134424.

The previous prime is 81403321. The next prime is 81403337. The reversal of 81403326 is 62330418.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 81403326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81403321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753681 + ... + 753788.

It is an arithmetic number, because the mean of its divisors is an integer number (11306025).

Almost surely, 2^81403326 is an apocalyptic number.

81403326 is an abundant number, since it is smaller than the sum of its proper divisors (99493074).

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

81403326 is a wasteful number, since it uses less digits than its factorization.

81403326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507480 (or 1507474 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 81403326 is about 9022.3791762484. The cubic root of 81403326 is about 433.3918265550.

The spelling of 81403326 in words is "eighty-one million, four hundred three thousand, three hundred twenty-six".