220407764 has 6 divisors (see below), whose sum is σ = 385713594. Its totient is φ = 110203880.

The previous prime is 220407763. The next prime is 220407791. The reversal of 220407764 is 467704022.

220407764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 219928900 + 478864 = 14830^2 + 692^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 220407764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220407763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27550967 + ... + 27550974.

It is an arithmetic number, because the mean of its divisors is an integer number (64285599).

Almost surely, 2^220407764 is an apocalyptic number.

It is an amenable number.

220407764 is a deficient number, since it is larger than the sum of its proper divisors (165305830).

220407764 is a wasteful number, since it uses less digits than its factorization.

220407764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55101945 (or 55101943 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 220407764 is about 14846.1363323930. The cubic root of 220407764 is about 604.0538122896.

The spelling of 220407764 in words is "two hundred twenty million, four hundred seven thousand, seven hundred sixty-four".