81828376 has 32 divisors (see below), whose sum is σ = 175645440. Its totient is φ = 35009568.

The previous prime is 81828353. The next prime is 81828377. The reversal of 81828376 is 67382818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81828377) 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, 52261 + ... + 53803.

It is an arithmetic number, because the mean of its divisors is an integer number (5488920).

Almost surely, 2^81828376 is an apocalyptic number.

It is an amenable number.

81828376 is an abundant number, since it is smaller than the sum of its proper divisors (93817064).

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

81828376 is a wasteful number, since it uses less digits than its factorization.

81828376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503 (or 2499 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 81828376 is about 9045.9038243837. The cubic root of 81828376 is about 434.1448404133.

The spelling of 81828376 in words is "eighty-one million, eight hundred twenty-eight thousand, three hundred seventy-six".