216425520 has 160 divisors (see below), whose sum is σ = 755279040. Its totient is φ = 57666816.

The previous prime is 216425519. The next prime is 216425533. The reversal of 216425520 is 25524612.

216425520 is a `hidden beast` number, since 216 + 425 + 5 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174342 + ... + 175578.

It is an arithmetic number, because the mean of its divisors is an integer number (4720494).

Almost surely, 2^216425520 is an apocalyptic number.

216425520 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 216425520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (377639520).

216425520 is an abundant number, since it is smaller than the sum of its proper divisors (538853520).

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

216425520 is an equidigital number, since it uses as much as digits as its factorization.

216425520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 216425520 is about 14711.4078184244. The cubic root of 216425520 is about 600.3937415561.

The spelling of 216425520 in words is "two hundred sixteen million, four hundred twenty-five thousand, five hundred twenty".