81252368 has 10 divisors (see below), whose sum is σ = 157426494. Its totient is φ = 40626176.

The previous prime is 81252359. The next prime is 81252377. The reversal of 81252368 is 86325218.

It is an interprime number because it is at equal distance from previous prime (81252359) and next prime (81252377).

It can be written as a sum of positive squares in only one way, i.e., 43454464 + 37797904 = 6592^2 + 6148^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2539121 + ... + 2539152.

Almost surely, 2^81252368 is an apocalyptic number.

It is an amenable number.

81252368 is a deficient number, since it is larger than the sum of its proper divisors (76174126).

81252368 is a wasteful number, since it uses less digits than its factorization.

81252368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5078281 (or 5078275 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 81252368 is about 9014.0095407094. The cubic root of 81252368 is about 433.1237603305.

The spelling of 81252368 in words is "eighty-one million, two hundred fifty-two thousand, three hundred sixty-eight".