220775646 has 64 divisors (see below), whose sum is σ = 547545600. Its totient is φ = 57787776.

The previous prime is 220775641. The next prime is 220775647. The reversal of 220775646 is 646577022.

It is a happy number.

220775646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220775641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74440 + ... + 77348.

It is an arithmetic number, because the mean of its divisors is an integer number (8555400).

Almost surely, 2^220775646 is an apocalyptic number.

220775646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 220775646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273772800).

220775646 is an abundant number, since it is smaller than the sum of its proper divisors (326769954).

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

220775646 is a wasteful number, since it uses less digits than its factorization.

220775646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 220775646 is about 14858.5209896544. The cubic root of 220775646 is about 604.3897003412.

The spelling of 220775646 in words is "two hundred twenty million, seven hundred seventy-five thousand, six hundred forty-six".