82661250 has 160 divisors (see below), whose sum is σ = 244721664. Its totient is φ = 18216000.

The previous prime is 82661239. The next prime is 82661251. The reversal of 82661250 is 5216628.

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

It is not an unprimeable number, because it can be changed into a prime (82661251) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1233717 + ... + 1233783.

Almost surely, 2^82661250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82661250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122360832).

82661250 is an abundant number, since it is smaller than the sum of its proper divisors (162060414).

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

82661250 is a wasteful number, since it uses less digits than its factorization.

82661250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 82661250 is about 9091.8232494918. The cubic root of 82661250 is about 435.6128236639.

Adding to 82661250 its reverse (5216628), we get a palindrome (87877878).

The spelling of 82661250 in words is "eighty-two million, six hundred sixty-one thousand, two hundred fifty".