81016380 has 72 divisors (see below), whose sum is σ = 258694800. Its totient is φ = 20466432.

The previous prime is 81016337. The next prime is 81016387. The reversal of 81016380 is 8361018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81016387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8425 + ... + 15264.

Almost surely, 2^81016380 is an apocalyptic number.

It is an amenable number.

81016380 is an abundant number, since it is smaller than the sum of its proper divisors (177678420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81016380 is a wasteful number, since it uses less digits than its factorization.

81016380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23723 (or 23718 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81016380 is about 9000.9099539991. The cubic root of 81016380 is about 432.7040346178.

Adding to 81016380 its reverse (8361018), we get a palindrome (89377398).

The spelling of 81016380 in words is "eighty-one million, sixteen thousand, three hundred eighty".