81200350 has 144 divisors (see below), whose sum is σ = 201522816. Its totient is φ = 24024000.

The previous prime is 81200291. The next prime is 81200351. The reversal of 81200350 is 5300218.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81200351) 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, 619785 + ... + 619915.

It is an arithmetic number, because the mean of its divisors is an integer number (1399464).

Almost surely, 2^81200350 is an apocalyptic number.

81200350 is an abundant number, since it is smaller than the sum of its proper divisors (120322466).

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

81200350 is a wasteful number, since it uses less digits than its factorization.

81200350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 81200350 is about 9011.1236813174. The cubic root of 81200350 is about 433.0313115728.

Adding to 81200350 its reverse (5300218), we get a palindrome (86500568).

The spelling of 81200350 in words is "eighty-one million, two hundred thousand, three hundred fifty".