69840828 has 72 divisors (see below), whose sum is σ = 188501040. Its totient is φ = 21726720.

The previous prime is 69840821. The next prime is 69840851. The reversal of 69840828 is 82804896.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69840821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84658 + ... + 85478.

It is an arithmetic number, because the mean of its divisors is an integer number (2618070).

Almost surely, 2^69840828 is an apocalyptic number.

69840828 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69840828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94250520).

69840828 is an abundant number, since it is smaller than the sum of its proper divisors (118660212).

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

69840828 is a wasteful number, since it uses less digits than its factorization.

69840828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 69840828 is about 8357.0825052766. The cubic root of 69840828 is about 411.8159151853.

The spelling of 69840828 in words is "sixty-nine million, eight hundred forty thousand, eight hundred twenty-eight".