680447628 has 144 divisors (see below), whose sum is σ = 2061556224. Its totient is φ = 192222720.

The previous prime is 680447611. The next prime is 680447639. The reversal of 680447628 is 826744086.

It is a super-3 number, since 3×680447628³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 659473 + ... + 660503.

Almost surely, 2^680447628 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 680447628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030778112).

680447628 is an abundant number, since it is smaller than the sum of its proper divisors (1381108596).

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

680447628 is a wasteful number, since it uses less digits than its factorization.

680447628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 680447628 is about 26085.3910838998. The cubic root of 680447628 is about 879.5588474090.

The spelling of 680447628 in words is "six hundred eighty million, four hundred forty-seven thousand, six hundred twenty-eight".