81214398 has 48 divisors (see below), whose sum is σ = 187820880. Its totient is φ = 25287552.

The previous prime is 81214381. The next prime is 81214411. The reversal of 81214398 is 89341218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23340 + ... + 26592.

It is an arithmetic number, because the mean of its divisors is an integer number (3912935).

Almost surely, 2^81214398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81214398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93910440).

81214398 is an abundant number, since it is smaller than the sum of its proper divisors (106606482).

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

81214398 is a wasteful number, since it uses less digits than its factorization.

81214398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353 (or 3350 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 81214398 is about 9011.9031286405. The cubic root of 81214398 is about 433.0562822085.

The spelling of 81214398 in words is "eighty-one million, two hundred fourteen thousand, three hundred ninety-eight".