81750532 has 6 divisors (see below), whose sum is σ = 143063438. Its totient is φ = 40875264.

The previous prime is 81750527. The next prime is 81750547. The reversal of 81750532 is 23505718.

It can be written as a sum of positive squares in only one way, i.e., 52330756 + 29419776 = 7234^2 + 5424^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81750494 and 81750503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10218813 + ... + 10218820.

Almost surely, 2^81750532 is an apocalyptic number.

It is an amenable number.

81750532 is a deficient number, since it is larger than the sum of its proper divisors (61312906).

81750532 is a wasteful number, since it uses less digits than its factorization.

81750532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20437637 (or 20437635 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 81750532 is about 9041.6000796319. The cubic root of 81750532 is about 434.0071282285.

The spelling of 81750532 in words is "eighty-one million, seven hundred fifty thousand, five hundred thirty-two".