81730344 has 16 divisors (see below), whose sum is σ = 204325920. Its totient is φ = 27243440.

The previous prime is 81730331. The next prime is 81730351. The reversal of 81730344 is 44303718.

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, 1702692 + ... + 1702739.

It is an arithmetic number, because the mean of its divisors is an integer number (12770370).

Almost surely, 2^81730344 is an apocalyptic number.

It is an amenable number.

81730344 is an abundant number, since it is smaller than the sum of its proper divisors (122595576).

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

81730344 is a wasteful number, since it uses less digits than its factorization.

81730344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405440 (or 3405436 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 81730344 is about 9040.4836153825. The cubic root of 81730344 is about 433.9713997873.

The spelling of 81730344 in words is "eighty-one million, seven hundred thirty thousand, three hundred forty-four".