81748427 has 8 divisors (see below), whose sum is σ = 86697216. Its totient is φ = 76815232.

The previous prime is 81748423. The next prime is 81748481. The reversal of 81748427 is 72484718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81748427 - 2² = 81748423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81748421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7958 + ... + 15060.

It is an arithmetic number, because the mean of its divisors is an integer number (10837152).

Almost surely, 2^81748427 is an apocalyptic number.

81748427 is a deficient number, since it is larger than the sum of its proper divisors (4948789).

81748427 is a wasteful number, since it uses less digits than its factorization.

81748427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7797.

The product of its digits is 100352, while the sum is 41.

The square root of 81748427 is about 9041.4836724953. The cubic root of 81748427 is about 434.0034031036.

The spelling of 81748427 in words is "eighty-one million, seven hundred forty-eight thousand, four hundred twenty-seven".