688972747 has 2 divisors, whose sum is σ = 688972748. Its totient is φ = 688972746.

The previous prime is 688972721. The next prime is 688972771. The reversal of 688972747 is 747279886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688972747 - 2¹¹ = 688970699 is a prime.

It is a super-2 number, since 2×688972747² = 949366892217452018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688972691 and 688972700.

It is not a weakly prime, because it can be changed into another prime (688972147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344486373 + 344486374.

It is an arithmetic number, because the mean of its divisors is an integer number (344486374).

Almost surely, 2^688972747 is an apocalyptic number.

688972747 is a deficient number, since it is larger than the sum of its proper divisors (1).

688972747 is an equidigital number, since it uses as much as digits as its factorization.

688972747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 58.

The square root of 688972747 is about 26248.2903633741. The cubic root of 688972747 is about 883.2168537366.

The spelling of 688972747 in words is "six hundred eighty-eight million, nine hundred seventy-two thousand, seven hundred forty-seven".