690406532 has 12 divisors (see below), whose sum is σ = 1240866060. Its totient is φ = 335873376.

The previous prime is 690406531. The next prime is 690406573. The reversal of 690406532 is 235604096.

It can be written as a sum of positive squares in 2 ways, for example, as 339443776 + 350962756 = 18424^2 + 18734^2 .

It is a super-2 number, since 2×690406532² = 953322358856534048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690406492 and 690406501.

It is not an unprimeable number, because it can be changed into a prime (690406531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2332307 + ... + 2332602.

It is an arithmetic number, because the mean of its divisors is an integer number (103405505).

Almost surely, 2^690406532 is an apocalyptic number.

It is an amenable number.

690406532 is a deficient number, since it is larger than the sum of its proper divisors (550459528).

690406532 is a wasteful number, since it uses less digits than its factorization.

690406532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664950 (or 4664948 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 690406532 is about 26275.5881380417. The cubic root of 690406532 is about 883.8291012971.

The spelling of 690406532 in words is "six hundred ninety million, four hundred six thousand, five hundred thirty-two".