64628220 has 48 divisors (see below), whose sum is σ = 191606688. Its totient is φ = 16220160.

The previous prime is 64628191. The next prime is 64628227. The reversal of 64628220 is 2282646.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64628227) 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, 30661 + ... + 32700.

It is an arithmetic number, because the mean of its divisors is an integer number (3991806).

Almost surely, 2^64628220 is an apocalyptic number.

64628220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64628220 is an abundant number, since it is smaller than the sum of its proper divisors (126978468).

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

64628220 is a wasteful number, since it uses less digits than its factorization.

64628220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63390 (or 63388 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 64628220 is about 8039.1678673853. The cubic root of 64628220 is about 401.3045325287.

The spelling of 64628220 in words is "sixty-four million, six hundred twenty-eight thousand, two hundred twenty".