81695230 has 16 divisors (see below), whose sum is σ = 151795584. Its totient is φ = 31623840.

The previous prime is 81695213. The next prime is 81695279. The reversal of 81695230 is 3259618.

It is a super-2 number, since 2×81695230² = 13348221209505800, which contains 22 as substring.

It is a congruent number.

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, 131457 + ... + 132076.

It is an arithmetic number, because the mean of its divisors is an integer number (9487224).

Almost surely, 2^81695230 is an apocalyptic number.

81695230 is a deficient number, since it is larger than the sum of its proper divisors (70100354).

81695230 is a wasteful number, since it uses less digits than its factorization.

81695230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263571.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 81695230 is about 9038.5413646229. The cubic root of 81695230 is about 433.9092415002.

The spelling of 81695230 in words is "eighty-one million, six hundred ninety-five thousand, two hundred thirty".