81294048 has 144 divisors (see below), whose sum is σ = 256628736. Its totient is φ = 24203520.

The previous prime is 81294043. The next prime is 81294049. The reversal of 81294048 is 84049218.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81294043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212065 + ... + 212447.

It is an arithmetic number, because the mean of its divisors is an integer number (1782144).

Almost surely, 2^81294048 is an apocalyptic number.

81294048 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81294048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128314368).

81294048 is an abundant number, since it is smaller than the sum of its proper divisors (175334688).

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

81294048 is a wasteful number, since it uses less digits than its factorization.

81294048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81294048 is about 9016.3212010221. The cubic root of 81294048 is about 433.1978074541.

The spelling of 81294048 in words is "eighty-one million, two hundred ninety-four thousand, forty-eight".