81019075392 has 112 divisors (see below), whose sum is σ = 243720396480. Its totient is φ = 26378279424.

The previous prime is 81019075387. The next prime is 81019075429. The reversal of 81019075392 is 29357091018.

81019075392 is a `hidden beast` number, since 8 + 1 + 0 + 190 + 75 + 392 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470883 + ... + 619490.

Almost surely, 2^81019075392 is an apocalyptic number.

It is an amenable number.

81019075392 is an abundant number, since it is smaller than the sum of its proper divisors (162701321088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81019075392 is a wasteful number, since it uses less digits than its factorization.

81019075392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090437 (or 1090421 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 81019075392 in words is "eighty-one billion, nineteen million, seventy-five thousand, three hundred ninety-two".