2179386720 has 432 divisors, whose sum is σ = 8799558768. Its totient is φ = 489646080.

The previous prime is 2179386719. The next prime is 2179386721. The reversal of 2179386720 is 276839712.

It is an interprime number because it is at equal distance from previous prime (2179386719) and next prime (2179386721).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2179386721) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4727290 + ... + 4727750.

It is an arithmetic number, because the mean of its divisors is an integer number (20369349).

Almost surely, 2^2179386720 is an apocalyptic number.

2179386720 is a gapful number since it is divisible by the number (20) 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 2179386720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4399779384).

2179386720 is an abundant number, since it is smaller than the sum of its proper divisors (6620172048).

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

2179386720 is a wasteful number, since it uses less digits than its factorization.

2179386720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 2179386720 is about 46683.9021505272. The cubic root of 2179386720 is about 1296.5166550031.

The spelling of 2179386720 in words is "two billion, one hundred seventy-nine million, three hundred eighty-six thousand, seven hundred twenty".