215151320 has 64 divisors (see below), whose sum is σ = 517531680. Its totient is φ = 80214016.

The previous prime is 215151301. The next prime is 215151329. The reversal of 215151320 is 23151512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 215151292 and 215151301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215151329) 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, 71282 + ... + 74238.

Almost surely, 2^215151320 is an apocalyptic number.

215151320 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 215151320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258765840).

215151320 is an abundant number, since it is smaller than the sum of its proper divisors (302380360).

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

215151320 is a wasteful number, since it uses less digits than its factorization.

215151320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092 (or 3088 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 215151320 is about 14668.0373601924. The cubic root of 215151320 is about 599.2131537579.

The spelling of 215151320 in words is "two hundred fifteen million, one hundred fifty-one thousand, three hundred twenty".