687625061 has 8 divisors (see below), whose sum is σ = 753180120. Its totient is φ = 624859648.

The previous prime is 687625049. The next prime is 687625073. The reversal of 687625061 is 160526786.

It is an interprime number because it is at equal distance from previous prime (687625049) and next prime (687625073).

It can be written as a sum of positive squares in 4 ways, for example, as 449694436 + 237930625 = 21206^2 + 15425^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687625061 - 2¹⁸ = 687362917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687625031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696896 + ... + 697881.

It is an arithmetic number, because the mean of its divisors is an integer number (94147515).

Almost surely, 2^687625061 is an apocalyptic number.

It is an amenable number.

687625061 is a deficient number, since it is larger than the sum of its proper divisors (65555059).

687625061 is a wasteful number, since it uses less digits than its factorization.

687625061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394823.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 687625061 is about 26222.6059155073. The cubic root of 687625061 is about 882.6405968163.

The spelling of 687625061 in words is "six hundred eighty-seven million, six hundred twenty-five thousand, sixty-one".