688890057 has 8 divisors (see below), whose sum is σ = 939881184. Its totient is φ = 448579488.

The previous prime is 688889969. The next prime is 688890101. The reversal of 688890057 is 750098886.

It is a happy number.

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

It is not a de Polignac number, because 688890057 - 2¹¹ = 688888009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688889991 and 688890009.

It is not an unprimeable number, because it can be changed into a prime (688890557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2669988 + ... + 2670245.

It is an arithmetic number, because the mean of its divisors is an integer number (117485148).

Almost surely, 2^688890057 is an apocalyptic number.

It is an amenable number.

688890057 is a deficient number, since it is larger than the sum of its proper divisors (250991127).

688890057 is a wasteful number, since it uses less digits than its factorization.

688890057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340279.

The product of its (nonzero) digits is 967680, while the sum is 51.

The square root of 688890057 is about 26246.7151659022. The cubic root of 688890057 is about 883.1815179782.

The spelling of 688890057 in words is "six hundred eighty-eight million, eight hundred ninety thousand, fifty-seven".