690731728628 has 12 divisors (see below), whose sum is σ = 1211665445760. Its totient is φ = 344541601272.

The previous prime is 690731728607. The next prime is 690731728649. The reversal of 690731728628 is 826827137096.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (690731728607) and next prime (690731728649).

It is a super-2 number, since 2×690731728628² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206063876 + ... + 206067227.

It is an arithmetic number, because the mean of its divisors is an integer number (100972120480).

Almost surely, 2^690731728628 is an apocalyptic number.

It is an amenable number.

690731728628 is a deficient number, since it is larger than the sum of its proper divisors (520933717132).

690731728628 is a wasteful number, since it uses less digits than its factorization.

690731728628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412131526 (or 412131524 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 690731728628 in words is "six hundred ninety billion, seven hundred thirty-one million, seven hundred twenty-eight thousand, six hundred twenty-eight".