81733248 has 48 divisors (see below), whose sum is σ = 235199250. Its totient is φ = 27244032.

The previous prime is 81733247. The next prime is 81733277. The reversal of 81733248 is 84233718.

It can be written as a sum of positive squares in only one way, i.e., 61591104 + 20142144 = 7848^2 + 4488^2 .

It is a tau number, because it is divible by the number of its divisors (48).

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

It is not an unprimeable number, because it can be changed into a prime (81733247) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34323 + ... + 36626.

Almost surely, 2^81733248 is an apocalyptic number.

It is an amenable number.

81733248 is an abundant number, since it is smaller than the sum of its proper divisors (153466002).

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

81733248 is a wasteful number, since it uses less digits than its factorization.

81733248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70969 (or 70954 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 81733248 is about 9040.6442248327. The cubic root of 81733248 is about 433.9765396083.

The spelling of 81733248 in words is "eighty-one million, seven hundred thirty-three thousand, two hundred forty-eight".