690345249 has 16 divisors (see below), whose sum is σ = 1028631744. Its totient is φ = 408185600.

The previous prime is 690345233. The next prime is 690345301. The reversal of 690345249 is 942543096.

It is a cyclic number.

It is not a de Polignac number, because 690345249 - 2⁴ = 690345233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690345249.

It is not an unprimeable number, because it can be changed into a prime (690340249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253764 + ... + 256469.

It is an arithmetic number, because the mean of its divisors is an integer number (64289484).

Almost surely, 2^690345249 is an apocalyptic number.

It is an amenable number.

690345249 is a deficient number, since it is larger than the sum of its proper divisors (338286495).

690345249 is a wasteful number, since it uses less digits than its factorization.

690345249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510288.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 690345249 is about 26274.4219536796. The cubic root of 690345249 is about 883.8029498926.

The spelling of 690345249 in words is "six hundred ninety million, three hundred forty-five thousand, two hundred forty-nine".