687479550 has 24 divisors (see below), whose sum is σ = 1704949656. Its totient is φ = 183327840.

The previous prime is 687479543. The next prime is 687479557. The reversal of 687479550 is 55974786.

It is an interprime number because it is at equal distance from previous prime (687479543) and next prime (687479557).

It is a junction number, because it is equal to n+sod(n) for n = 687479493 and 687479502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687479557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2291449 + ... + 2291748.

It is an arithmetic number, because the mean of its divisors is an integer number (71039569).

Almost surely, 2^687479550 is an apocalyptic number.

687479550 is an abundant number, since it is smaller than the sum of its proper divisors (1017470106).

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

687479550 is a wasteful number, since it uses less digits than its factorization.

687479550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583212 (or 4583207 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The square root of 687479550 is about 26219.8312351548. The cubic root of 687479550 is about 882.5783327601.

The spelling of 687479550 in words is "six hundred eighty-seven million, four hundred seventy-nine thousand, five hundred fifty".