690987634 has 8 divisors (see below), whose sum is σ = 1048127580. Its totient is φ = 341611776.

The previous prime is 690987607. The next prime is 690987701. The reversal of 690987634 is 436789096.

690987634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 668377609 + 22610025 = 25853^2 + 4755^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

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, 1940799 + ... + 1941154.

Almost surely, 2^690987634 is an apocalyptic number.

690987634 is a deficient number, since it is larger than the sum of its proper divisors (357139946).

690987634 is a wasteful number, since it uses less digits than its factorization.

690987634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882044.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 690987634 is about 26286.6436427323. The cubic root of 690987634 is about 884.0769991214.

The spelling of 690987634 in words is "six hundred ninety million, nine hundred eighty-seven thousand, six hundred thirty-four".