81077833 has 8 divisors (see below), whose sum is σ = 83575008. Its totient is φ = 78608544.

The previous prime is 81077831. The next prime is 81077837. The reversal of 81077833 is 33877018.

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

It is a cyclic number.

It is not a de Polignac number, because 81077833 - 2¹ = 81077831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81077792 and 81077801.

It is not an unprimeable number, because it can be changed into a prime (81077831) 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, 991 + ... + 12772.

It is an arithmetic number, because the mean of its divisors is an integer number (10446876).

Almost surely, 2^81077833 is an apocalyptic number.

It is an amenable number.

81077833 is a deficient number, since it is larger than the sum of its proper divisors (2497175).

81077833 is a wasteful number, since it uses less digits than its factorization.

81077833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13943.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 81077833 is about 9004.3230173067. The cubic root of 81077833 is about 432.8134126660.

The spelling of 81077833 in words is "eighty-one million, seventy-seven thousand, eight hundred thirty-three".