81376620 has 216 divisors, whose sum is σ = 275106384. Its totient is φ = 17860608.

The previous prime is 81376613. The next prime is 81376621. The reversal of 81376620 is 2667318.

It is not an unprimeable number, because it can be changed into a prime (81376621) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4282971 + ... + 4282989.

Almost surely, 2^81376620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81376620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137553192).

81376620 is an abundant number, since it is smaller than the sum of its proper divisors (193729764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81376620 is a wasteful number, since it uses less digits than its factorization.

81376620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 81376620 is about 9020.8990682747. The cubic root of 81376620 is about 433.3444270664.

The spelling of 81376620 in words is "eighty-one million, three hundred seventy-six thousand, six hundred twenty".