64628628 has 48 divisors (see below), whose sum is σ = 163586304. Its totient is φ = 19778560.

The previous prime is 64628623. The next prime is 64628647. The reversal of 64628628 is 82682646.

It is a self number, because there is not a number n which added to its sum of digits gives 64628628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64628621) 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, 4501 + ... + 12227.

It is an arithmetic number, because the mean of its divisors is an integer number (3408048).

Almost surely, 2^64628628 is an apocalyptic number.

64628628 is a gapful number since it is divisible by the number (68) 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 64628628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81793152).

64628628 is an abundant number, since it is smaller than the sum of its proper divisors (98957676).

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

64628628 is a wasteful number, since it uses less digits than its factorization.

64628628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792 (or 7790 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 64628628 is about 8039.1932431059. The cubic root of 64628628 is about 401.3053770097.

It can be divided in two parts, 64628 and 628, that added together give a palindrome (65256).

The spelling of 64628628 in words is "sixty-four million, six hundred twenty-eight thousand, six hundred twenty-eight".