81504574 has 8 divisors (see below), whose sum is σ = 122648400. Its totient is φ = 40621776.

The previous prime is 81504557. The next prime is 81504583. The reversal of 81504574 is 47540518.

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

It is a congruent number.

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, 64474 + ... + 65725.

It is an arithmetic number, because the mean of its divisors is an integer number (15331050).

Almost surely, 2^81504574 is an apocalyptic number.

81504574 is a deficient number, since it is larger than the sum of its proper divisors (41143826).

81504574 is a wasteful number, since it uses less digits than its factorization.

81504574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130514.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 81504574 is about 9027.9883695096. The cubic root of 81504574 is about 433.5714337773.

The spelling of 81504574 in words is "eighty-one million, five hundred four thousand, five hundred seventy-four".