81577433 has 8 divisors (see below), whose sum is σ = 93715968. Its totient is φ = 69560064.

The previous prime is 81577429. The next prime is 81577439. The reversal of 81577433 is 33477518.

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

It is not a de Polignac number, because 81577433 - 2² = 81577429 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81577439) 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, 28841 + ... + 31542.

It is an arithmetic number, because the mean of its divisors is an integer number (11714496).

Almost surely, 2^81577433 is an apocalyptic number.

It is an amenable number.

81577433 is a deficient number, since it is larger than the sum of its proper divisors (12138535).

81577433 is a wasteful number, since it uses less digits than its factorization.

81577433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60583.

The product of its digits is 70560, while the sum is 38.

The square root of 81577433 is about 9032.0226416900. The cubic root of 81577433 is about 433.7005887899.

The spelling of 81577433 in words is "eighty-one million, five hundred seventy-seven thousand, four hundred thirty-three".