81877398 has 8 divisors (see below), whose sum is σ = 163754808. Its totient is φ = 27292464.

The previous prime is 81877391. The next prime is 81877399. The reversal of 81877398 is 89377818.

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

81877398 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81877398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81877391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6823111 + ... + 6823122.

It is an arithmetic number, because the mean of its divisors is an integer number (20469351).

Almost surely, 2^81877398 is an apocalyptic number.

81877398 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.

81877398 is a wasteful number, since it uses less digits than its factorization.

81877398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13646238.

The product of its digits is 677376, while the sum is 51.

The square root of 81877398 is about 9048.6130428923. The cubic root of 81877398 is about 434.2315193902.

The spelling of 81877398 in words is "eighty-one million, eight hundred seventy-seven thousand, three hundred ninety-eight".