81892628 has 12 divisors (see below), whose sum is σ = 143528532. Its totient is φ = 40884480.

The previous prime is 81892619. The next prime is 81892637. The reversal of 81892628 is 82629818.

It is an interprime number because it is at equal distance from previous prime (81892619) and next prime (81892637).

It can be written as a sum of positive squares in 2 ways, for example, as 53993104 + 27899524 = 7348^2 + 5282^2 .

It is a congruent number.

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, 12413 + ... + 17828.

It is an arithmetic number, because the mean of its divisors is an integer number (11960711).

Almost surely, 2^81892628 is an apocalyptic number.

It is an amenable number.

81892628 is a deficient number, since it is larger than the sum of its proper divisors (61635904).

81892628 is a wasteful number, since it uses less digits than its factorization.

81892628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30922 (or 30920 counting only the distinct ones).

The product of its digits is 110592, while the sum is 44.

The square root of 81892628 is about 9049.4545691992. The cubic root of 81892628 is about 434.2584414965.

The spelling of 81892628 in words is "eighty-one million, eight hundred ninety-two thousand, six hundred twenty-eight".