81750350990 has 192 divisors, whose sum is σ = 191504590848. Its totient is φ = 24834700800.

The previous prime is 81750350987. The next prime is 81750350993. The reversal of 81750350990 is 9905305718.

It is an interprime number because it is at equal distance from previous prime (81750350987) and next prime (81750350993).

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81750350993) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 79291775 + ... + 79292805.

It is an arithmetic number, because the mean of its divisors is an integer number (997419744).

Almost surely, 2^81750350990 is an apocalyptic number.

81750350990 is an abundant number, since it is smaller than the sum of its proper divisors (109754239858).

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

81750350990 is a wasteful number, since it uses less digits than its factorization.

81750350990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1416 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 47.

The spelling of 81750350990 in words is "eighty-one billion, seven hundred fifty million, three hundred fifty thousand, nine hundred ninety".