81377486 has 8 divisors (see below), whose sum is σ = 122104584. Its totient is φ = 40675960.

The previous prime is 81377441. The next prime is 81377501. The reversal of 81377486 is 68477318.

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

It is a Curzon number.

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, 8561 + ... + 15363.

It is an arithmetic number, because the mean of its divisors is an integer number (15263073).

Almost surely, 2^81377486 is an apocalyptic number.

81377486 is a deficient number, since it is larger than the sum of its proper divisors (40727098).

81377486 is a wasteful number, since it uses less digits than its factorization.

81377486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12786.

The product of its digits is 225792, while the sum is 44.

The square root of 81377486 is about 9020.9470677973. The cubic root of 81377486 is about 433.3459642604.

The spelling of 81377486 in words is "eighty-one million, three hundred seventy-seven thousand, four hundred eighty-six".