1616722990 has 16 divisors (see below), whose sum is σ = 2910763152. Its totient is φ = 646542144.

The previous prime is 1616722981. The next prime is 1616722993. The reversal of 1616722990 is 992276161.

It is a happy number.

It is a super-2 number, since 2×1616722990² = 5227586452789080200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616722993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35242 + ... + 66898.

It is an arithmetic number, because the mean of its divisors is an integer number (181922697).

Almost surely, 2^1616722990 is an apocalyptic number.

1616722990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1616722990 is a deficient number, since it is larger than the sum of its proper divisors (1294040162).

1616722990 is a wasteful number, since it uses less digits than its factorization.

1616722990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36771.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1616722990 is about 40208.4940031332. The cubic root of 1616722990 is about 1173.6678404651.

The spelling of 1616722990 in words is "one billion, six hundred sixteen million, seven hundred twenty-two thousand, nine hundred ninety".