81604310 has 16 divisors (see below), whose sum is σ = 147711600. Its totient is φ = 32458656.

The previous prime is 81604279. The next prime is 81604321. The reversal of 81604310 is 1340618.

It is a super-2 number, since 2×81604310² = 13318526821152200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21005 + ... + 24584.

It is an arithmetic number, because the mean of its divisors is an integer number (9231975).

Almost surely, 2^81604310 is an apocalyptic number.

81604310 is a deficient number, since it is larger than the sum of its proper divisors (66107290).

81604310 is a wasteful number, since it uses less digits than its factorization.

81604310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45775.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 81604310 is about 9033.5103918687. The cubic root of 81604310 is about 433.7482134429.

Adding to 81604310 its reverse (1340618), we get a palindrome (82944928).

The spelling of 81604310 in words is "eighty-one million, six hundred four thousand, three hundred ten".