687051437 has 4 divisors (see below), whose sum is σ = 687535680. Its totient is φ = 686567196.

The previous prime is 687051427. The next prime is 687051439. The reversal of 687051437 is 734150786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 734150786 = 2 ⋅367075393.

It is a cyclic number.

It is not a de Polignac number, because 687051437 - 2⁶ = 687051373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687051394 and 687051403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687051439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239987 + ... + 242832.

It is an arithmetic number, because the mean of its divisors is an integer number (171883920).

Almost surely, 2^687051437 is an apocalyptic number.

It is an amenable number.

687051437 is a deficient number, since it is larger than the sum of its proper divisors (484243).

687051437 is a wasteful number, since it uses less digits than its factorization.

687051437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484242.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 687051437 is about 26211.6660477735. Note that the first 3 decimals coincide. The cubic root of 687051437 is about 882.3950925381.

The spelling of 687051437 in words is "six hundred eighty-seven million, fifty-one thousand, four hundred thirty-seven".