81136350 has 48 divisors (see below), whose sum is σ = 223579440. Its totient is φ = 21636000.

The previous prime is 81136339. The next prime is 81136369. The reversal of 81136350 is 5363118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28701 + ... + 31400.

It is an arithmetic number, because the mean of its divisors is an integer number (4657905).

Almost surely, 2^81136350 is an apocalyptic number.

81136350 is an abundant number, since it is smaller than the sum of its proper divisors (142443090).

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

81136350 is a wasteful number, since it uses less digits than its factorization.

81136350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60122 (or 60111 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 81136350 is about 9007.5718148678. The cubic root of 81136350 is about 432.9175136713.

Adding to 81136350 its reverse (5363118), we get a palindrome (86499468).

The spelling of 81136350 in words is "eighty-one million, one hundred thirty-six thousand, three hundred fifty".