688166087 has 8 divisors (see below), whose sum is σ = 788706336. Its totient is φ = 588183552.

The previous prime is 688166051. The next prime is 688166123. The reversal of 688166087 is 780661886.

It is an interprime number because it is at equal distance from previous prime (688166051) and next prime (688166123).

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 688166087 - 2¹⁸ = 687903943 is a prime.

It is a super-3 number, since 3×688166087³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688166047) 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, 136778 + ... + 141719.

It is an arithmetic number, because the mean of its divisors is an integer number (98588292).

Almost surely, 2^688166087 is an apocalyptic number.

688166087 is a deficient number, since it is larger than the sum of its proper divisors (100540249).

688166087 is a wasteful number, since it uses less digits than its factorization.

688166087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278857.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 688166087 is about 26232.9199099147. The cubic root of 688166087 is about 882.8720244514.

The spelling of 688166087 in words is "six hundred eighty-eight million, one hundred sixty-six thousand, eighty-seven".