81158248 has 16 divisors (see below), whose sum is σ = 157080960. Its totient is φ = 39270000.

The previous prime is 81158219. The next prime is 81158263. The reversal of 81158248 is 84285118.

It is a happy number.

It is a super-2 number, since 2×81158248² = 13173322436859008, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 163378 + ... + 163873.

It is an arithmetic number, because the mean of its divisors is an integer number (9817560).

Almost surely, 2^81158248 is an apocalyptic number.

It is an amenable number.

81158248 is a deficient number, since it is larger than the sum of its proper divisors (75922712).

81158248 is a wasteful number, since it uses less digits than its factorization.

81158248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327288 (or 327284 counting only the distinct ones).

The product of its digits is 20480, while the sum is 37.

The square root of 81158248 is about 9008.7872657756. The cubic root of 81158248 is about 432.9564570672.

It can be divided in two parts, 81158 and 248, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 81158248 in words is "eighty-one million, one hundred fifty-eight thousand, two hundred forty-eight".