81048874 has 4 divisors (see below), whose sum is σ = 121573314. Its totient is φ = 40524436.

The previous prime is 81048853. The next prime is 81048883. The reversal of 81048874 is 47884018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 73839649 + 7209225 = 8593^2 + 2685^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20262217 + ... + 20262220.

Almost surely, 2^81048874 is an apocalyptic number.

81048874 is a deficient number, since it is larger than the sum of its proper divisors (40524440).

81048874 is a wasteful number, since it uses less digits than its factorization.

81048874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40524439.

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 81048874 is about 9002.7148127662. The cubic root of 81048874 is about 432.7618764417.

The spelling of 81048874 in words is "eighty-one million, forty-eight thousand, eight hundred seventy-four".