82015770 has 64 divisors (see below), whose sum is σ = 210263040. Its totient is φ = 20428800.

The previous prime is 82015753. The next prime is 82015777. The reversal of 82015770 is 7751028.

It is a happy number.

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 (82015777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25450 + ... + 28490.

It is an arithmetic number, because the mean of its divisors is an integer number (3285360).

Almost surely, 2^82015770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82015770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105131520).

82015770 is an abundant number, since it is smaller than the sum of its proper divisors (128247270).

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

82015770 is a wasteful number, since it uses less digits than its factorization.

82015770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 82015770 is about 9056.2558488594. The cubic root of 82015770 is about 434.4759973905.

Adding to 82015770 its reverse (7751028), we get a palindrome (89766798).

The spelling of 82015770 in words is "eighty-two million, fifteen thousand, seven hundred seventy".