687800747 has 2 divisors, whose sum is σ = 687800748. Its totient is φ = 687800746.

The previous prime is 687800723. The next prime is 687800753. The reversal of 687800747 is 747008786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687800747 - 2⁶ = 687800683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687800767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343900373 + 343900374.

It is an arithmetic number, because the mean of its divisors is an integer number (343900374).

Almost surely, 2^687800747 is an apocalyptic number.

687800747 is a deficient number, since it is larger than the sum of its proper divisors (1).

687800747 is an equidigital number, since it uses as much as digits as its factorization.

687800747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 526848, while the sum is 47.

The square root of 687800747 is about 26225.9555974611. The cubic root of 687800747 is about 882.7157610301.

The spelling of 687800747 in words is "six hundred eighty-seven million, eight hundred thousand, seven hundred forty-seven".