687474740 has 24 divisors (see below), whose sum is σ = 1452899112. Its totient is φ = 273237120.

The previous prime is 687474737. The next prime is 687474773. The reversal of 687474740 is 47474786.

It can be written as a sum of positive squares in 4 ways, for example, as 11682724 + 675792016 = 3418^2 + 25996^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106331 + ... + 112610.

It is an arithmetic number, because the mean of its divisors is an integer number (60537463).

Almost surely, 2^687474740 is an apocalyptic number.

It is an amenable number.

687474740 is an abundant number, since it is smaller than the sum of its proper divisors (765424372).

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

687474740 is a wasteful number, since it uses less digits than its factorization.

687474740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219107 (or 219105 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 47.

The square root of 687474740 is about 26219.7395105291. The cubic root of 687474740 is about 882.5762744144.

The spelling of 687474740 in words is "six hundred eighty-seven million, four hundred seventy-four thousand, seven hundred forty".