81200032 has 12 divisors (see below), whose sum is σ = 159862626. Its totient is φ = 40600000.

The previous prime is 81200023. The next prime is 81200059. The reversal of 81200032 is 23000218.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 52940176 + 28259856 = 7276^2 + 5316^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 81199979 and 81200015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1268719 + ... + 1268782.

Almost surely, 2^81200032 is an apocalyptic number.

It is an amenable number.

81200032 is a deficient number, since it is larger than the sum of its proper divisors (78662594).

81200032 is a wasteful number, since it uses less digits than its factorization.

81200032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537511 (or 2537503 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 81200032 is about 9011.1060364419. The cubic root of 81200032 is about 433.0307462873.

The spelling of 81200032 in words is "eighty-one million, two hundred thousand, thirty-two".