81932402 has 8 divisors (see below), whose sum is σ = 122992236. Its totient is φ = 40934992.

The previous prime is 81932387. The next prime is 81932413. The reversal of 81932402 is 20423918.

It can be written as a sum of positive squares in 2 ways, for example, as 81739681 + 192721 = 9041^2 + 439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 12173 + ... + 17664.

Almost surely, 2^81932402 is an apocalyptic number.

81932402 is a deficient number, since it is larger than the sum of its proper divisors (41059834).

81932402 is a wasteful number, since it uses less digits than its factorization.

81932402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31212.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 81932402 is about 9051.6518934391. The cubic root of 81932402 is about 434.3287343509.

The spelling of 81932402 in words is "eighty-one million, nine hundred thirty-two thousand, four hundred two".