81484940 has 12 divisors (see below), whose sum is σ = 171118416. Its totient is φ = 32593968.

The previous prime is 81484937. The next prime is 81484951. The reversal of 81484940 is 4948418.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 81484894 and 81484903.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2037104 + ... + 2037143.

It is an arithmetic number, because the mean of its divisors is an integer number (14259868).

Almost surely, 2^81484940 is an apocalyptic number.

It is an amenable number.

81484940 is an abundant number, since it is smaller than the sum of its proper divisors (89633476).

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

81484940 is a wasteful number, since it uses less digits than its factorization.

81484940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074256 (or 4074254 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 81484940 is about 9026.9009078421. The cubic root of 81484940 is about 433.5366159965.

The spelling of 81484940 in words is "eighty-one million, four hundred eighty-four thousand, nine hundred forty".