690355 has 4 divisors (see below), whose sum is σ = 828432. Its totient is φ = 552280.

The previous prime is 690341. The next prime is 690367. The reversal of 690355 is 553096.

It is a happy number.

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

It is not a de Polignac number, because 690355 - 2⁵ = 690323 is a prime.

It is a Duffinian number.

690355 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69031 + ... + 69040.

It is an arithmetic number, because the mean of its divisors is an integer number (207108).

2⁶⁹⁰³⁵⁵ is an apocalyptic number.

690355 is a deficient number, since it is larger than the sum of its proper divisors (138077).

690355 is a wasteful number, since it uses less digits than its factorization.

690355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138076.

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

The square root of 690355 is about 830.8760437033. The cubic root of 690355 is about 88.3807111058.

The spelling of 690355 in words is "six hundred ninety thousand, three hundred fifty-five".