81042748 has 6 divisors (see below), whose sum is σ = 141824816. Its totient is φ = 40521372.

The previous prime is 81042743. The next prime is 81042751. The reversal of 81042748 is 84724018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81042743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130340 + ... + 10130347.

Almost surely, 2^81042748 is an apocalyptic number.

It is an amenable number.

81042748 is a deficient number, since it is larger than the sum of its proper divisors (60782068).

81042748 is a wasteful number, since it uses less digits than its factorization.

81042748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20260691 (or 20260689 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 81042748 is about 9002.3745756328. The cubic root of 81042748 is about 432.7509728724.

The spelling of 81042748 in words is "eighty-one million, forty-two thousand, seven hundred forty-eight".