81749267900 has 36 divisors (see below), whose sum is σ = 179389143360. Its totient is φ = 32332291200.

The previous prime is 81749267879. The next prime is 81749267923. The reversal of 81749267900 is 976294718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4583756 + ... + 4601555.

It is an arithmetic number, because the mean of its divisors is an integer number (4983031760).

Almost surely, 2^81749267900 is an apocalyptic number.

It is an amenable number.

81749267900 is an abundant number, since it is smaller than the sum of its proper divisors (97639875460).

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

81749267900 is a wasteful number, since it uses less digits than its factorization.

81749267900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9185414 (or 9185407 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 81749267900 in words is "eighty-one billion, seven hundred forty-nine million, two hundred sixty-seven thousand, nine hundred".