691388058 has 8 divisors (see below), whose sum is σ = 1382776128. Its totient is φ = 230462684.

The previous prime is 691388057. The next prime is 691388063. The reversal of 691388058 is 850883196.

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

691388058 is an admirable number.

It is a super-3 number, since 3×691388058³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 691387998 and 691388016.

It is not an unprimeable number, because it can be changed into a prime (691388051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57615666 + ... + 57615677.

It is an arithmetic number, because the mean of its divisors is an integer number (172847016).

Almost surely, 2^691388058 is an apocalyptic number.

691388058 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691388058 is a wasteful number, since it uses less digits than its factorization.

691388058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115231348.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 691388058 is about 26294.2590312030. The cubic root of 691388058 is about 884.2477389298.

The spelling of 691388058 in words is "six hundred ninety-one million, three hundred eighty-eight thousand, fifty-eight".