690845493 has 16 divisors (see below), whose sum is σ = 993053376. Its totient is φ = 424677120.

The previous prime is 690845471. The next prime is 690845497. The reversal of 690845493 is 394548096.

It is not a de Polignac number, because 690845493 - 2²⁰ = 689796917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690845497) 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 15 ways as a sum of consecutive naturals, for example, 29038 + ... + 47168.

It is an arithmetic number, because the mean of its divisors is an integer number (62065836).

Almost surely, 2^690845493 is an apocalyptic number.

It is an amenable number.

690845493 is a deficient number, since it is larger than the sum of its proper divisors (302207883).

690845493 is a wasteful number, since it uses less digits than its factorization.

690845493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19124.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 690845493 is about 26283.9398302461. The cubic root of 690845493 is about 884.0163746856.

The spelling of 690845493 in words is "six hundred ninety million, eight hundred forty-five thousand, four hundred ninety-three".