690255640 has 32 divisors (see below), whose sum is σ = 1554028560. Its totient is φ = 275932800.

The previous prime is 690255613. The next prime is 690255649. The reversal of 690255640 is 46552096.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 690255640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690255649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76150 + ... + 84730.

Almost surely, 2^690255640 is an apocalyptic number.

It is an amenable number.

690255640 is an abundant number, since it is smaller than the sum of its proper divisors (863772920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690255640 is a wasteful number, since it uses less digits than its factorization.

690255640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10603 (or 10599 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 690255640 is about 26272.7166467421. The cubic root of 690255640 is about 883.7647080971.

The spelling of 690255640 in words is "six hundred ninety million, two hundred fifty-five thousand, six hundred forty".