690535 has 4 divisors (see below), whose sum is σ = 828648. Its totient is φ = 552424.

The previous prime is 690533. The next prime is 690541. The reversal of 690535 is 535096.

It is a happy number.

690535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690535 - 2¹ = 690533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69049 + ... + 69058.

It is an arithmetic number, because the mean of its divisors is an integer number (207162).

2⁶⁹⁰⁵³⁵ is an apocalyptic number.

690535 is a deficient number, since it is larger than the sum of its proper divisors (138113).

690535 is a wasteful number, since it uses less digits than its factorization.

690535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138112.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 690535 is about 830.9843560501. The cubic root of 690535 is about 88.3883917655.

It can be divided in two parts, 690 and 535, that added together give a triangular number (1225 = T₄₉).

The spelling of 690535 in words is "six hundred ninety thousand, five hundred thirty-five".