690646245 has 16 divisors (see below), whose sum is σ = 1108226880. Its totient is φ = 367280384.

The previous prime is 690646183. The next prime is 690646249. The reversal of 690646245 is 542646096.

690646245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 690646245 - 2¹¹ = 690644197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 690646197 and 690646206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690646249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61140 + ... + 71549.

It is an arithmetic number, because the mean of its divisors is an integer number (69264180).

Almost surely, 2^690646245 is an apocalyptic number.

It is an amenable number.

690646245 is a deficient number, since it is larger than the sum of its proper divisors (417580635).

690646245 is a wasteful number, since it uses less digits than its factorization.

690646245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133044.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 690646245 is about 26280.1492575670. The cubic root of 690646245 is about 883.9313795926.

The spelling of 690646245 in words is "six hundred ninety million, six hundred forty-six thousand, two hundred forty-five".