688071427 has 4 divisors (see below), whose sum is σ = 717987600. Its totient is φ = 658155256.

The previous prime is 688071409. The next prime is 688071431. The reversal of 688071427 is 724170886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724170886 = 2 ⋅362085443.

It is a cyclic number.

It is not a de Polignac number, because 688071427 - 2¹¹ = 688069379 is a prime.

It is a super-3 number, since 3×688071427³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688071407) 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, 14958052 + ... + 14958097.

It is an arithmetic number, because the mean of its divisors is an integer number (179496900).

Almost surely, 2^688071427 is an apocalyptic number.

688071427 is a deficient number, since it is larger than the sum of its proper divisors (29916173).

688071427 is a wasteful number, since it uses less digits than its factorization.

688071427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29916172.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 688071427 is about 26231.1156262939. The cubic root of 688071427 is about 882.8315417348.

The spelling of 688071427 in words is "six hundred eighty-eight million, seventy-one thousand, four hundred twenty-seven".