81750396 has 96 divisors (see below), whose sum is σ = 240368128. Its totient is φ = 21047040.

The previous prime is 81750373. The next prime is 81750401. The reversal of 81750396 is 69305718.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 31 ways as a sum of consecutive naturals, for example, 46086 + ... + 47826.

Almost surely, 2^81750396 is an apocalyptic number.

81750396 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81750396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120184064).

81750396 is an abundant number, since it is smaller than the sum of its proper divisors (158617732).

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

81750396 is a wasteful number, since it uses less digits than its factorization.

81750396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1809 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 81750396 is about 9041.5925588361. The cubic root of 81750396 is about 434.0068875573.

The spelling of 81750396 in words is "eighty-one million, seven hundred fifty thousand, three hundred ninety-six".