688145973 has 4 divisors (see below), whose sum is σ = 917527968. Its totient is φ = 458763980.

The previous prime is 688145957. The next prime is 688145999. The reversal of 688145973 is 379541886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688145973 - 2⁴ = 688145957 is a prime.

It is a super-2 number, since 2×688145973² = 947089760312233458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688145903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114690993 + ... + 114690998.

It is an arithmetic number, because the mean of its divisors is an integer number (229381992).

Almost surely, 2^688145973 is an apocalyptic number.

It is an amenable number.

688145973 is a deficient number, since it is larger than the sum of its proper divisors (229381995).

688145973 is a wasteful number, since it uses less digits than its factorization.

688145973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229381994.

The product of its digits is 1451520, while the sum is 51.

The square root of 688145973 is about 26232.5365338543. The cubic root of 688145973 is about 882.8634227193.

The spelling of 688145973 in words is "six hundred eighty-eight million, one hundred forty-five thousand, nine hundred seventy-three".