81252830 has 16 divisors (see below), whose sum is σ = 146871360. Its totient is φ = 32364192.

The previous prime is 81252827. The next prime is 81252839. The reversal of 81252830 is 3825218.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81252793 and 81252802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81252839) 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, 14609 + ... + 19388.

It is an arithmetic number, because the mean of its divisors is an integer number (9179460).

Almost surely, 2^81252830 is an apocalyptic number.

81252830 is a deficient number, since it is larger than the sum of its proper divisors (65618530).

81252830 is a wasteful number, since it uses less digits than its factorization.

81252830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34243.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 81252830 is about 9014.0351674486. The cubic root of 81252830 is about 433.1245812411.

The spelling of 81252830 in words is "eighty-one million, two hundred fifty-two thousand, eight hundred thirty".