691635248 has 10 divisors (see below), whose sum is σ = 1340043324. Its totient is φ = 345817616.

The previous prime is 691635247. The next prime is 691635251. The reversal of 691635248 is 842536196.

It is a junction number, because it is equal to n+sod(n) for n = 691635199 and 691635208.

It is not an unprimeable number, because it can be changed into a prime (691635247) 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 as a sum of consecutive naturals, namely, 21613586 + ... + 21613617.

Almost surely, 2^691635248 is an apocalyptic number.

It is an amenable number.

691635248 is a deficient number, since it is larger than the sum of its proper divisors (648408076).

691635248 is a wasteful number, since it uses less digits than its factorization.

691635248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43227211 (or 43227205 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 691635248 is about 26298.9590668528. The cubic root of 691635248 is about 884.3531072307.

The spelling of 691635248 in words is "six hundred ninety-one million, six hundred thirty-five thousand, two hundred forty-eight".