628042644 has 72 divisors (see below), whose sum is σ = 1687838880. Its totient is φ = 196344000.

The previous prime is 628042637. The next prime is 628042687. The reversal of 628042644 is 446240826.

It is a happy number.

628042644 is a `hidden beast` number, since 6 + 2 + 8 + 0 + 4 + 2 + 644 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 628042599 and 628042608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64539 + ... + 73629.

Almost surely, 2^628042644 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 628042644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843919440).

628042644 is an abundant number, since it is smaller than the sum of its proper divisors (1059796236).

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

628042644 is a wasteful number, since it uses less digits than its factorization.

628042644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9221 (or 9216 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

The square root of 628042644 is about 25060.7789982674. The cubic root of 628042644 is about 856.3731541189.

The spelling of 628042644 in words is "six hundred twenty-eight million, forty-two thousand, six hundred forty-four".