690980 has 12 divisors (see below), whose sum is σ = 1451100. Its totient is φ = 276384.

The previous prime is 690953. The next prime is 690997. The reversal of 690980 is 89096.

690980 = T₂₉₆ + T₂₉₇ + ... + T₃₁₀.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 495616 + 195364 = 704^2 + 442^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

690980 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, 17255 + ... + 17294.

It is an arithmetic number, because the mean of its divisors is an integer number (120925).

2⁶⁹⁰⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

690980 is an abundant number, since it is smaller than the sum of its proper divisors (760120).

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

690980 is a wasteful number, since it uses less digits than its factorization.

690980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34558 (or 34556 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 690980 is about 831.2520676666. The cubic root of 690980 is about 88.4073743362.

The spelling of 690980 in words is "six hundred ninety thousand, nine hundred eighty".