690491228 has 24 divisors (see below), whose sum is σ = 1383537792. Its totient is φ = 295377264.

The previous prime is 690491203. The next prime is 690491231. The reversal of 690491228 is 822194096.

It is a super-3 number, since 3×690491228³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 7226 + ... + 37857.

It is an arithmetic number, because the mean of its divisors is an integer number (57647408).

Almost surely, 2^690491228 is an apocalyptic number.

It is an amenable number.

690491228 is an abundant number, since it is smaller than the sum of its proper divisors (693046564).

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

690491228 is a wasteful number, since it uses less digits than its factorization.

690491228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45641 (or 45639 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 690491228 is about 26277.1997747096. The cubic root of 690491228 is about 883.8652412259.

The spelling of 690491228 in words is "six hundred ninety million, four hundred ninety-one thousand, two hundred twenty-eight".