81048240 has 240 divisors, whose sum is σ = 335270208. Its totient is φ = 17086464.

The previous prime is 81048223. The next prime is 81048263. The reversal of 81048240 is 4284018.

It is a tau number, because it is divible by the number of its divisors (240).

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, 64902 + ... + 66138.

Almost surely, 2^81048240 is an apocalyptic number.

81048240 is a gapful number since it is divisible by the number (80) 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 81048240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167635104).

81048240 is an abundant number, since it is smaller than the sum of its proper divisors (254221968).

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

81048240 is a wasteful number, since it uses less digits than its factorization.

81048240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276 (or 1267 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 81048240 is about 9002.6796010966. The cubic root of 81048240 is about 432.7607480207.

The spelling of 81048240 in words is "eighty-one million, forty-eight thousand, two hundred forty".