690081 has 16 divisors (see below), whose sum is σ = 1113984. Its totient is φ = 370944.

The previous prime is 690073. The next prime is 690089. The reversal of 690081 is 180096.

It is an interprime number because it is at equal distance from previous prime (690073) and next prime (690089).

It is not a de Polignac number, because 690081 - 2³ = 690073 is a prime.

It is a super-2 number, since 2×690081² = 952423573122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (690089) 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, 610 + ... + 1323.

It is an arithmetic number, because the mean of its divisors is an integer number (69624).

2⁶⁹⁰⁰⁸¹ is an apocalyptic number.

It is an amenable number.

690081 is a deficient number, since it is larger than the sum of its proper divisors (423903).

690081 is a wasteful number, since it uses less digits than its factorization.

690081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 690081 is about 830.7111411315. The cubic root of 690081 is about 88.3690168715.

The spelling of 690081 in words is "six hundred ninety thousand, eighty-one".