81574867 has 8 divisors (see below), whose sum is σ = 89856000. Its totient is φ = 73437960.

The previous prime is 81574861. The next prime is 81574877. The reversal of 81574867 is 76847518.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81574867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81574861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34867 + ... + 37132.

It is an arithmetic number, because the mean of its divisors is an integer number (11232000).

Almost surely, 2^81574867 is an apocalyptic number.

81574867 is a deficient number, since it is larger than the sum of its proper divisors (8281133).

81574867 is a wasteful number, since it uses less digits than its factorization.

81574867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72113.

The product of its digits is 376320, while the sum is 46.

The square root of 81574867 is about 9031.8805904418. The cubic root of 81574867 is about 433.6960414238.

The spelling of 81574867 in words is "eighty-one million, five hundred seventy-four thousand, eight hundred sixty-seven".