690020571 has 4 divisors (see below), whose sum is σ = 920027432. Its totient is φ = 460013712.

The previous prime is 690020563. The next prime is 690020609. The reversal of 690020571 is 175020096.

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

It is not a de Polignac number, because 690020571 - 2³ = 690020563 is a prime.

It is a super-2 number, since 2×690020571² = 952256776806332082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690020501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115003426 + ... + 115003431.

It is an arithmetic number, because the mean of its divisors is an integer number (230006858).

Almost surely, 2^690020571 is an apocalyptic number.

690020571 is a deficient number, since it is larger than the sum of its proper divisors (230006861).

690020571 is a wasteful number, since it uses less digits than its factorization.

690020571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230006860.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 690020571 is about 26268.2426325021. The cubic root of 690020571 is about 883.6643736406.

The spelling of 690020571 in words is "six hundred ninety million, twenty thousand, five hundred seventy-one".