690550 has 24 divisors (see below), whose sum is σ = 1468656. Its totient is φ = 236640.

The previous prime is 690541. The next prime is 690553. The reversal of 690550 is 55096.

It is a happy number.

690550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690553) by changing a digit.

690550 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (61194).

2⁶⁹⁰⁵⁵⁰ is an apocalyptic number.

690550 is an abundant number, since it is smaller than the sum of its proper divisors (778106).

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

690550 is a wasteful number, since it uses less digits than its factorization.

690550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992 (or 1987 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 690550 is about 830.9933814418. The cubic root of 690550 is about 88.3890317603.

The spelling of 690550 in words is "six hundred ninety thousand, five hundred fifty".