690005999 has 8 divisors (see below), whose sum is σ = 701715120. Its totient is φ = 678338496.

The previous prime is 690005989. The next prime is 690006061. The reversal of 690005999 is 999500096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 690005999 - 2⁴ = 690005983 is a prime.

It is a super-2 number, since 2×690005999² = 952216557311976002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690005909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23987 + ... + 44219.

It is an arithmetic number, because the mean of its divisors is an integer number (87714390).

Almost surely, 2^690005999 is an apocalyptic number.

690005999 is a deficient number, since it is larger than the sum of its proper divisors (11709121).

690005999 is a wasteful number, since it uses less digits than its factorization.

690005999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20809.

The product of its (nonzero) digits is 196830, while the sum is 47.

The square root of 690005999 is about 26267.9652618927. The cubic root of 690005999 is about 883.6581531266.

The spelling of 690005999 in words is "six hundred ninety million, five thousand, nine hundred ninety-nine".