81504458 has 16 divisors (see below), whose sum is σ = 141492480. Its totient is φ = 34487856.

The previous prime is 81504431. The next prime is 81504463. The reversal of 81504458 is 85440518.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35741 + ... + 37952.

It is an arithmetic number, because the mean of its divisors is an integer number (8843280).

Almost surely, 2^81504458 is an apocalyptic number.

81504458 is a deficient number, since it is larger than the sum of its proper divisors (59988022).

81504458 is a wasteful number, since it uses less digits than its factorization.

81504458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73781.

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 81504458 is about 9027.9819450418. The cubic root of 81504458 is about 433.5712280861.

The spelling of 81504458 in words is "eighty-one million, five hundred four thousand, four hundred fifty-eight".