64620220 has 72 divisors (see below), whose sum is σ = 159095664. Its totient is φ = 21982464.

The previous prime is 64620217. The next prime is 64620229. The reversal of 64620220 is 2202646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64620191 and 64620200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64620229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228199 + ... + 228481.

It is an arithmetic number, because the mean of its divisors is an integer number (2209662).

Almost surely, 2^64620220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64620220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79547832).

64620220 is an abundant number, since it is smaller than the sum of its proper divisors (94475444).

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

64620220 is a wasteful number, since it uses less digits than its factorization.

64620220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 64620220 is about 8038.6702880514. The cubic root of 64620220 is about 401.2879733603.

Adding to 64620220 its reverse (2202646), we get a palindrome (66822866).

The spelling of 64620220 in words is "sixty-four million, six hundred twenty thousand, two hundred twenty".