690495 has 16 divisors (see below), whose sum is σ = 1190112. Its totient is φ = 339840.

The previous prime is 690493. The next prime is 690509. The reversal of 690495 is 594096.

690495 = 11² + 12² + ... + 127².

It is a happy number.

It is not a de Polignac number, because 690495 - 2¹ = 690493 is a prime.

690495 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576 + ... + 1965.

It is an arithmetic number, because the mean of its divisors is an integer number (74382).

2⁶⁹⁰⁴⁹⁵ is an apocalyptic number.

690495 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

690495 is a deficient number, since it is larger than the sum of its proper divisors (499617).

690495 is a wasteful number, since it uses less digits than its factorization.

690495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3562.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 690495 is about 830.9602878598. The cubic root of 690495 is about 88.3866850676.

The spelling of 690495 in words is "six hundred ninety thousand, four hundred ninety-five".