3215239920 has 640 divisors, whose sum is σ = 12650618880. Its totient is φ = 755453952.

The previous prime is 3215239919. The next prime is 3215239933. The reversal of 3215239920 is 299325123.

3215239920 is a `hidden beast` number, since 3 + 21 + 523 + 99 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 68409337 + ... + 68409383.

It is an arithmetic number, because the mean of its divisors is an integer number (19766592).

Almost surely, 2^3215239920 is an apocalyptic number.

3215239920 is a gapful number since it is divisible by the number (30) 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 3215239920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6325309440).

3215239920 is an abundant number, since it is smaller than the sum of its proper divisors (9435378960).

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

3215239920 is a wasteful number, since it uses less digits than its factorization.

3215239920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 3215239920 is about 56703.0856303253. The cubic root of 3215239920 is about 1475.9482432774.

The spelling of 3215239920 in words is "three billion, two hundred fifteen million, two hundred thirty-nine thousand, nine hundred twenty".