81769528 has 8 divisors (see below), whose sum is σ = 153317880. Its totient is φ = 40884760.

The previous prime is 81769517. The next prime is 81769549. The reversal of 81769528 is 82596718.

It is a tau number, because it is divible by the number of its divisors (8).

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, 5110588 + ... + 5110603.

It is an arithmetic number, because the mean of its divisors is an integer number (19164735).

Almost surely, 2^81769528 is an apocalyptic number.

81769528 is the 4834-th centered heptagonal number.

It is an amenable number.

81769528 is a deficient number, since it is larger than the sum of its proper divisors (71548352).

81769528 is a wasteful number, since it uses less digits than its factorization.

81769528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10221197 (or 10221193 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 81769528 is about 9042.6504963976. The cubic root of 81769528 is about 434.0407417138.

The spelling of 81769528 in words is "eighty-one million, seven hundred sixty-nine thousand, five hundred twenty-eight".