687135550 has 12 divisors (see below), whose sum is σ = 1278072216. Its totient is φ = 274854200.

The previous prime is 687135539. The next prime is 687135593. The reversal of 687135550 is 55531786.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6871306 + ... + 6871405.

It is an arithmetic number, because the mean of its divisors is an integer number (106506018).

Almost surely, 2^687135550 is an apocalyptic number.

687135550 is a deficient number, since it is larger than the sum of its proper divisors (590936666).

687135550 is a wasteful number, since it uses less digits than its factorization.

687135550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13742723 (or 13742718 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 687135550 is about 26213.2704941600. The cubic root of 687135550 is about 882.4311004533.

The spelling of 687135550 in words is "six hundred eighty-seven million, one hundred thirty-five thousand, five hundred fifty".