82151780 has 48 divisors (see below), whose sum is σ = 179928000. Its totient is φ = 31468416.

The previous prime is 82151779. The next prime is 82151807. The reversal of 82151780 is 8715128.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80111 + ... + 81129.

It is an arithmetic number, because the mean of its divisors is an integer number (3748500).

Almost surely, 2^82151780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82151780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89964000).

82151780 is an abundant number, since it is smaller than the sum of its proper divisors (97776220).

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

82151780 is a wasteful number, since it uses less digits than its factorization.

82151780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 82151780 is about 9063.7619121422. The cubic root of 82151780 is about 434.7160343370.

The spelling of 82151780 in words is "eighty-two million, one hundred fifty-one thousand, seven hundred eighty".