81769250 has 32 divisors (see below), whose sum is σ = 153653760. Its totient is φ = 32583600.

The previous prime is 81769249. The next prime is 81769267. The reversal of 81769250 is 5296718.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94319 + ... + 95181.

It is an arithmetic number, because the mean of its divisors is an integer number (4801680).

Almost surely, 2^81769250 is an apocalyptic number.

81769250 is a deficient number, since it is larger than the sum of its proper divisors (71884510).

81769250 is a wasteful number, since it uses less digits than its factorization.

81769250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259 (or 1249 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 81769250 is about 9042.6351247853. The cubic root of 81769250 is about 434.0402498295.

The spelling of 81769250 in words is "eighty-one million, seven hundred sixty-nine thousand, two hundred fifty".