690216787 has 12 divisors (see below), whose sum is σ = 749093664. Its totient is φ = 635675040.

The previous prime is 690216749. The next prime is 690216797. The reversal of 690216787 is 787612096.

It is a happy number.

It is not a de Polignac number, because 690216787 - 2²³ = 681828179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690216707) 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 11 ways as a sum of consecutive naturals, for example, 73837 + ... + 82657.

It is an arithmetic number, because the mean of its divisors is an integer number (62424472).

Almost surely, 2^690216787 is an apocalyptic number.

690216787 is a deficient number, since it is larger than the sum of its proper divisors (58876877).

690216787 is a wasteful number, since it uses less digits than its factorization.

690216787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9310 (or 9297 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 690216787 is about 26271.9772190827. The cubic root of 690216787 is about 883.7481260501.

The spelling of 690216787 in words is "six hundred ninety million, two hundred sixteen thousand, seven hundred eighty-seven".