81572948 has 12 divisors (see below), whose sum is σ = 144087552. Its totient is φ = 40405080.

The previous prime is 81572941. The next prime is 81572963. The reversal of 81572948 is 84927518.

It is a junction number, because it is equal to n+sod(n) for n = 81572899 and 81572908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81572941) 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 3 ways as a sum of consecutive naturals, for example, 94868 + ... + 95723.

It is an arithmetic number, because the mean of its divisors is an integer number (12007296).

Almost surely, 2^81572948 is an apocalyptic number.

It is an amenable number.

81572948 is a deficient number, since it is larger than the sum of its proper divisors (62514604).

81572948 is a wasteful number, since it uses less digits than its factorization.

81572948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190702 (or 190700 counting only the distinct ones).

The product of its digits is 161280, while the sum is 44.

The square root of 81572948 is about 9031.7743550202. The cubic root of 81572948 is about 433.6926405837.

The spelling of 81572948 in words is "eighty-one million, five hundred seventy-two thousand, nine hundred forty-eight".