81952406 has 8 divisors (see below), whose sum is σ = 126894144. Its totient is φ = 39654360.

The previous prime is 81952397. The next prime is 81952471. The reversal of 81952406 is 60425918.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660845 + ... + 660968.

It is an arithmetic number, because the mean of its divisors is an integer number (15861768).

Almost surely, 2^81952406 is an apocalyptic number.

81952406 is a deficient number, since it is larger than the sum of its proper divisors (44941738).

81952406 is a wasteful number, since it uses less digits than its factorization.

81952406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321846.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 81952406 is about 9052.7568176771. The cubic root of 81952406 is about 434.3640789553.

It can be divided in two parts, 8195 and 2406, that added together give a palindrome (10601).

The spelling of 81952406 in words is "eighty-one million, nine hundred fifty-two thousand, four hundred six".