81715350 has 48 divisors (see below), whose sum is σ = 204964560. Its totient is φ = 21542400.

The previous prime is 81715331. The next prime is 81715367. The reversal of 81715350 is 5351718.

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

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, 10290 + ... + 16410.

It is an arithmetic number, because the mean of its divisors is an integer number (4270095).

Almost surely, 2^81715350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81715350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102482280).

81715350 is an abundant number, since it is smaller than the sum of its proper divisors (123249210).

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

81715350 is a wasteful number, since it uses less digits than its factorization.

81715350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6225 (or 6220 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 81715350 is about 9039.6543075496. The cubic root of 81715350 is about 433.9448598072.

The spelling of 81715350 in words is "eighty-one million, seven hundred fifteen thousand, three hundred fifty".