81510468 has 48 divisors (see below), whose sum is σ = 205489536. Its totient is φ = 24998400.

The previous prime is 81510463. The next prime is 81510469. The reversal of 81510468 is 86401518.

It is not an unprimeable number, because it can be changed into a prime (81510463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61905 + ... + 63207.

It is an arithmetic number, because the mean of its divisors is an integer number (4281032).

Almost surely, 2^81510468 is an apocalyptic number.

It is an amenable number.

81510468 is an abundant number, since it is smaller than the sum of its proper divisors (123979068).

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

81510468 is a wasteful number, since it uses less digits than its factorization.

81510468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724 (or 1722 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 81510468 is about 9028.3147929168. The cubic root of 81510468 is about 433.5818847590.

The spelling of 81510468 in words is "eighty-one million, five hundred ten thousand, four hundred sixty-eight".