81424748 has 12 divisors (see below), whose sum is σ = 145182240. Its totient is φ = 39944112.

The previous prime is 81424741. The next prime is 81424751. The reversal of 81424748 is 84742418.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81424741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191828 + ... + 192251.

It is an arithmetic number, because the mean of its divisors is an integer number (12098520).

Almost surely, 2^81424748 is an apocalyptic number.

It is an amenable number.

81424748 is a deficient number, since it is larger than the sum of its proper divisors (63757492).

81424748 is a wasteful number, since it uses less digits than its factorization.

81424748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384136 (or 384134 counting only the distinct ones).

The product of its digits is 57344, while the sum is 38.

The square root of 81424748 is about 9023.5662573065. The cubic root of 81424748 is about 433.4298401755.

The spelling of 81424748 in words is "eighty-one million, four hundred twenty-four thousand, seven hundred forty-eight".