81488040 has 32 divisors (see below), whose sum is σ = 244464480. Its totient is φ = 21730112.

The previous prime is 81488003. The next prime is 81488059. The reversal of 81488040 is 4088418.

It is a junction number, because it is equal to n+sod(n) for n = 81487992 and 81488010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339414 + ... + 339653.

It is an arithmetic number, because the mean of its divisors is an integer number (7639515).

Almost surely, 2^81488040 is an apocalyptic number.

It is an amenable number.

81488040 is an abundant number, since it is smaller than the sum of its proper divisors (162976440).

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

81488040 is a wasteful number, since it uses less digits than its factorization.

81488040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679081 (or 679077 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 81488040 is about 9027.0726151948. The cubic root of 81488040 is about 433.5421137259.

The spelling of 81488040 in words is "eighty-one million, four hundred eighty-eight thousand, forty".