687690486 has 112 divisors (see below), whose sum is σ = 1809798144. Its totient is φ = 191791152.

The previous prime is 687690463. The next prime is 687690533. The reversal of 687690486 is 684096786.

687690486 is a `hidden beast` number, since 6 + 8 + 76 + 90 + 486 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 438075 + ... + 439641.

It is an arithmetic number, because the mean of its divisors is an integer number (16158912).

Almost surely, 2^687690486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687690486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904899072).

687690486 is an abundant number, since it is smaller than the sum of its proper divisors (1122107658).

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

687690486 is a wasteful number, since it uses less digits than its factorization.

687690486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637 (or 1622 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 687690486 is about 26223.8533781746. The cubic root of 687690486 is about 882.6685892660.

The spelling of 687690486 in words is "six hundred eighty-seven million, six hundred ninety thousand, four hundred eighty-six".