690718820 has 36 divisors (see below), whose sum is σ = 1594367292. Its totient is φ = 251169600.

The previous prime is 690718811. The next prime is 690718829. The reversal of 690718820 is 28817096.

It is an interprime number because it is at equal distance from previous prime (690718811) and next prime (690718829).

It can be written as a sum of positive squares in 2 ways, for example, as 205750336 + 484968484 = 14344^2 + 22022^2 .

It is not an unprimeable number, because it can be changed into a prime (690718829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140291 + ... + 145130.

Almost surely, 2^690718820 is an apocalyptic number.

It is an amenable number.

690718820 is an abundant number, since it is smaller than the sum of its proper divisors (903648472).

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

690718820 is a wasteful number, since it uses less digits than its factorization.

690718820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285452 (or 285439 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 690718820 is about 26281.5300163442. The cubic root of 690718820 is about 883.9623404853.

The spelling of 690718820 in words is "six hundred ninety million, seven hundred eighteen thousand, eight hundred twenty".