1609690290 has 64 divisors (see below), whose sum is σ = 4164967296. Its totient is φ = 395799552.

The previous prime is 1609690289. The next prime is 1609690301. The reversal of 1609690290 is 920969061.

It is a happy number.

It is a super-2 number, since 2×1609690290² = 5182205659440568200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498762 + ... + 501978.

It is an arithmetic number, because the mean of its divisors is an integer number (65077614).

Almost surely, 2^1609690290 is an apocalyptic number.

1609690290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1609690290 is an abundant number, since it is smaller than the sum of its proper divisors (2555277006).

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

1609690290 is a wasteful number, since it uses less digits than its factorization.

1609690290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 1609690290 is about 40120.9457764894. The cubic root of 1609690290 is about 1171.9635594016.

The spelling of 1609690290 in words is "one billion, six hundred nine million, six hundred ninety thousand, two hundred ninety".