690740 has 12 divisors (see below), whose sum is σ = 1450596. Its totient is φ = 276288.

The previous prime is 690721. The next prime is 690757. The reversal of 690740 is 47096.

690740 = 8² + 9² + ... + 127².

It can be written as a sum of positive squares in 2 ways, for example, as 178084 + 512656 = 422^2 + 716^2 .

It is a congruent number.

It is an unprimeable number.

690740 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 3 ways as a sum of consecutive naturals, for example, 17249 + ... + 17288.

It is an arithmetic number, because the mean of its divisors is an integer number (120883).

2⁶⁹⁰⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

690740 is an abundant number, since it is smaller than the sum of its proper divisors (759856).

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

690740 is a wasteful number, since it uses less digits than its factorization.

690740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34546 (or 34544 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 690740 is about 831.1076945860. The cubic root of 690740 is about 88.3971375581.

The spelling of 690740 in words is "six hundred ninety thousand, seven hundred forty".