690206638 has 16 divisors (see below), whose sum is σ = 1129924224. Its totient is φ = 313592760.

The previous prime is 690206633. The next prime is 690206677. The reversal of 690206638 is 836602096.

It is a self number, because there is not a number n which added to its sum of digits gives 690206638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690206633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58081 + ... + 68947.

It is an arithmetic number, because the mean of its divisors is an integer number (70620264).

Almost surely, 2^690206638 is an apocalyptic number.

690206638 is a deficient number, since it is larger than the sum of its proper divisors (439717586).

690206638 is a wasteful number, since it uses less digits than its factorization.

690206638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13767.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 690206638 is about 26271.7840657996. The cubic root of 690206638 is about 883.7437944624.

The spelling of 690206638 in words is "six hundred ninety million, two hundred six thousand, six hundred thirty-eight".