688903973 has 2 divisors, whose sum is σ = 688903974. Its totient is φ = 688903972.

The previous prime is 688903967. The next prime is 688903987. The reversal of 688903973 is 379309886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628655329 + 60248644 = 25073^2 + 7762^2 .

It is a cyclic number.

It is not a de Polignac number, because 688903973 - 2⁶ = 688903909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688003973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344451986 + 344451987.

It is an arithmetic number, because the mean of its divisors is an integer number (344451987).

Almost surely, 2^688903973 is an apocalyptic number.

It is an amenable number.

688903973 is a deficient number, since it is larger than the sum of its proper divisors (1).

688903973 is an equidigital number, since it uses as much as digits as its factorization.

688903973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 688903973 is about 26246.9802644038. The cubic root of 688903973 is about 883.1874648736.

The spelling of 688903973 in words is "six hundred eighty-eight million, nine hundred three thousand, nine hundred seventy-three".