81375662 has 8 divisors (see below), whose sum is σ = 122298456. Its totient is φ = 40609512.

The previous prime is 81375661. The next prime is 81375683. The reversal of 81375662 is 26657318.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81375661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37853 + ... + 39944.

It is an arithmetic number, because the mean of its divisors is an integer number (15287307).

Almost surely, 2^81375662 is an apocalyptic number.

81375662 is a deficient number, since it is larger than the sum of its proper divisors (40922794).

81375662 is a wasteful number, since it uses less digits than its factorization.

81375662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78322.

The product of its digits is 60480, while the sum is 38.

The square root of 81375662 is about 9020.8459691982. The cubic root of 81375662 is about 433.3427265551.

The spelling of 81375662 in words is "eighty-one million, three hundred seventy-five thousand, six hundred sixty-two".