81893448 has 192 divisors, whose sum is σ = 283046400. Its totient is φ = 20805120.

The previous prime is 81893429. The next prime is 81893489. The reversal of 81893448 is 84439818.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189793 + ... + 190223.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^81893448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81893448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141523200).

81893448 is an abundant number, since it is smaller than the sum of its proper divisors (201152952).

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

81893448 is a wasteful number, since it uses less digits than its factorization.

81893448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 485 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 81893448 is about 9049.4998756837. The cubic root of 81893448 is about 434.2598909177.

The spelling of 81893448 in words is "eighty-one million, eight hundred ninety-three thousand, four hundred forty-eight".