81385050 has 24 divisors (see below), whose sum is σ = 201835296. Its totient is φ = 21702640.

The previous prime is 81384943. The next prime is 81385067. The reversal of 81385050 is 5058318.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 81384999 and 81385017.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271134 + ... + 271433.

It is an arithmetic number, because the mean of its divisors is an integer number (8409804).

Almost surely, 2^81385050 is an apocalyptic number.

81385050 is an abundant number, since it is smaller than the sum of its proper divisors (120450246).

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

81385050 is a wasteful number, since it uses less digits than its factorization.

81385050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542582 (or 542577 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 81385050 is about 9021.3663045018. The cubic root of 81385050 is about 433.3593902806.

The spelling of 81385050 in words is "eighty-one million, three hundred eighty-five thousand, fifty".