81870835 has 8 divisors (see below), whose sum is σ = 98328960. Its totient is φ = 65440704.

The previous prime is 81870821. The next prime is 81870847. The reversal of 81870835 is 53807818.

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 81870835 - 2⁷ = 81870707 is a prime.

It is an unprimeable number.

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, 94 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (12291120).

Almost surely, 2^81870835 is an apocalyptic number.

81870835 is a deficient number, since it is larger than the sum of its proper divisors (16458125).

81870835 is a wasteful number, since it uses less digits than its factorization.

81870835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13997.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 81870835 is about 9048.2503833614. The cubic root of 81870835 is about 434.2199169306.

The spelling of 81870835 in words is "eighty-one million, eight hundred seventy thousand, eight hundred thirty-five".