628478664 has 64 divisors (see below), whose sum is σ = 1746411840. Its totient is φ = 186850560.

The previous prime is 628478663. The next prime is 628478687. The reversal of 628478664 is 466874826.

628478664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×628478664² = 789970862206449792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628478663) 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, 8467 + ... + 36450.

It is an arithmetic number, because the mean of its divisors is an integer number (27287685).

Almost surely, 2^628478664 is an apocalyptic number.

It is an amenable number.

628478664 is an abundant number, since it is smaller than the sum of its proper divisors (1117933176).

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

628478664 is a wasteful number, since it uses less digits than its factorization.

628478664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44990 (or 44986 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 51.

The square root of 628478664 is about 25069.4767396529. The cubic root of 628478664 is about 856.5712879289.

It can be divided in two parts, 6284 and 78664, that added together give a palindrome (84948).

The spelling of 628478664 in words is "six hundred twenty-eight million, four hundred seventy-eight thousand, six hundred sixty-four".