687974071 has 16 divisors (see below), whose sum is σ = 747252000. Its totient is φ = 631204224.

The previous prime is 687974069. The next prime is 687974083. The reversal of 687974071 is 170479786.

It is not a de Polignac number, because 687974071 - 2¹ = 687974069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687971071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1351365 + ... + 1351873.

It is an arithmetic number, because the mean of its divisors is an integer number (46703250).

Almost surely, 2^687974071 is an apocalyptic number.

687974071 is a deficient number, since it is larger than the sum of its proper divisors (59277929).

687974071 is an frugal number, since it uses more digits than its factorization.

687974071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 687974071 is about 26229.2598256222. The cubic root of 687974071 is about 882.7899021616.

The spelling of 687974071 in words is "six hundred eighty-seven million, nine hundred seventy-four thousand, seventy-one".