81049712 has 10 divisors (see below), whose sum is σ = 157033848. Its totient is φ = 40524848.

The previous prime is 81049691. The next prime is 81049729. The reversal of 81049712 is 21794018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2532788 + ... + 2532819.

Almost surely, 2^81049712 is an apocalyptic number.

It is an amenable number.

81049712 is a deficient number, since it is larger than the sum of its proper divisors (75984136).

81049712 is a wasteful number, since it uses less digits than its factorization.

81049712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065615 (or 5065609 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 81049712 is about 9002.7613541624. The cubic root of 81049712 is about 432.7633679418.

The spelling of 81049712 in words is "eighty-one million, forty-nine thousand, seven hundred twelve".