690620069 has 4 divisors (see below), whose sum is σ = 690801900. Its totient is φ = 690438240.

The previous prime is 690620041. The next prime is 690620083. The reversal of 690620069 is 960026096.

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

It can be written as a sum of positive squares in 2 ways, for example, as 463756225 + 226863844 = 21535^2 + 15062^2 .

It is a cyclic number.

It is not a de Polignac number, because 690620069 - 2¹⁶ = 690554533 is a prime.

It is a super-2 number, since 2×690620069² = 953912159411129522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690620039) 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, 85094 + ... + 92855.

It is an arithmetic number, because the mean of its divisors is an integer number (172700475).

Almost surely, 2^690620069 is an apocalyptic number.

It is an amenable number.

690620069 is a deficient number, since it is larger than the sum of its proper divisors (181831).

690620069 is a wasteful number, since it uses less digits than its factorization.

690620069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181830.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 690620069 is about 26279.6512343676. The cubic root of 690620069 is about 883.9202122353.

The spelling of 690620069 in words is "six hundred ninety million, six hundred twenty thousand, sixty-nine".