69871920 has 80 divisors (see below), whose sum is σ = 217486080. Its totient is φ = 18556672.

The previous prime is 69871909. The next prime is 69871927. The reversal of 69871920 is 2917896.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (69871927) 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, 82861 + ... + 83699.

It is an arithmetic number, because the mean of its divisors is an integer number (2718576).

Almost surely, 2^69871920 is an apocalyptic number.

69871920 is a gapful number since it is divisible by the number (60) 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 69871920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108743040).

69871920 is an abundant number, since it is smaller than the sum of its proper divisors (147614160).

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

69871920 is a wasteful number, since it uses less digits than its factorization.

69871920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1196 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 69871920 is about 8358.9425168498. The cubic root of 69871920 is about 411.8770173667.

The spelling of 69871920 in words is "sixty-nine million, eight hundred seventy-one thousand, nine hundred twenty".