81306352 has 10 divisors (see below), whose sum is σ = 157531088. Its totient is φ = 40653168.

The previous prime is 81306341. The next prime is 81306373. The reversal of 81306352 is 25360318.

It is a super-2 number, since 2×81306352² = 13221445751095808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81306352.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540808 + ... + 2540839.

Almost surely, 2^81306352 is an apocalyptic number.

It is an amenable number.

81306352 is a deficient number, since it is larger than the sum of its proper divisors (76224736).

81306352 is a wasteful number, since it uses less digits than its factorization.

81306352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5081655 (or 5081649 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 81306352 is about 9017.0034934007. The cubic root of 81306352 is about 433.2196614400.

The spelling of 81306352 in words is "eighty-one million, three hundred six thousand, three hundred fifty-two".