81401662 has 8 divisors (see below), whose sum is σ = 128529000. Its totient is φ = 38558664.

The previous prime is 81401659. The next prime is 81401699. The reversal of 81401662 is 26610418.

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

It is a super-3 number, since 3×81401662³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81401662.

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, 1071037 + ... + 1071112.

It is an arithmetic number, because the mean of its divisors is an integer number (16066125).

Almost surely, 2^81401662 is an apocalyptic number.

81401662 is a deficient number, since it is larger than the sum of its proper divisors (47127338).

81401662 is a wasteful number, since it uses less digits than its factorization.

81401662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142170.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81401662 is about 9022.2869606325. The cubic root of 81401662 is about 433.3888734860.

The spelling of 81401662 in words is "eighty-one million, four hundred one thousand, six hundred sixty-two".