687139488 has 288 divisors, whose sum is σ = 2335132800. Its totient is φ = 187619328.

The previous prime is 687139457. The next prime is 687139517. The reversal of 687139488 is 884931786.

687139488 is a `hidden beast` number, since 68 + 71 + 39 + 488 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a nude number because it is divisible by every one of its digits.

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, 6303978 + ... + 6304086.

It is an arithmetic number, because the mean of its divisors is an integer number (8108100).

Almost surely, 2^687139488 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 687139488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1167566400).

687139488 is an abundant number, since it is smaller than the sum of its proper divisors (1647993312).

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

687139488 is a wasteful number, since it uses less digits than its factorization.

687139488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 233 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 687139488 is about 26213.3456086780. The cubic root of 687139488 is about 882.4327861988.

The spelling of 687139488 in words is "six hundred eighty-seven million, one hundred thirty-nine thousand, four hundred eighty-eight".