83278520 has 64 divisors (see below), whose sum is σ = 212436000. Its totient is φ = 29127168.

The previous prime is 83278499. The next prime is 83278523. The reversal of 83278520 is 2587238.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83278523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5666 + ... + 14094.

Almost surely, 2^83278520 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 83278520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106218000).

83278520 is an abundant number, since it is smaller than the sum of its proper divisors (129157480).

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

83278520 is a wasteful number, since it uses less digits than its factorization.

83278520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8472 (or 8468 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 83278520 is about 9125.7065479885. The cubic root of 83278520 is about 436.6944436487.

The spelling of 83278520 in words is "eighty-three million, two hundred seventy-eight thousand, five hundred twenty".