81348840 has 64 divisors (see below), whose sum is σ = 271166400. Its totient is φ = 21692736.

The previous prime is 81348811. The next prime is 81348863. The reversal of 81348840 is 4884318.

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

It is a junction number, because it is equal to n+sod(n) for n = 81348795 and 81348804.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36582 + ... + 38741.

It is an arithmetic number, because the mean of its divisors is an integer number (4236975).

Almost surely, 2^81348840 is an apocalyptic number.

It is an amenable number.

81348840 is an abundant number, since it is smaller than the sum of its proper divisors (189817560).

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

81348840 is a wasteful number, since it uses less digits than its factorization.

81348840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75343 (or 75333 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 81348840 is about 9019.3591790104. The cubic root of 81348840 is about 433.2951103695.

The spelling of 81348840 in words is "eighty-one million, three hundred forty-eight thousand, eight hundred forty".