688530780 has 288 divisors, whose sum is σ = 2546858496. Its totient is φ = 152845056.

The previous prime is 688530779. The next prime is 688530803. The reversal of 688530780 is 87035886.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1258467 + ... + 1259013.

Almost surely, 2^688530780 is an apocalyptic number.

688530780 is a gapful number since it is divisible by the number (60) 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 688530780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273429248).

688530780 is an abundant number, since it is smaller than the sum of its proper divisors (1858327716).

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

688530780 is a wasteful number, since it uses less digits than its factorization.

688530780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 688530780 is about 26239.8700454099. The cubic root of 688530780 is about 883.0279559883.

The spelling of 688530780 in words is "six hundred eighty-eight million, five hundred thirty thousand, seven hundred eighty".