1916813648 has 40 divisors (see below), whose sum is σ = 3976520040. Its totient is φ = 891883520.

The previous prime is 1916813627. The next prime is 1916813663. The reversal of 1916813648 is 8463186191.

It can be written as a sum of positive squares in 4 ways, for example, as 244985104 + 1671828544 = 15652^2 + 40888^2 .

It is a super-2 number, since 2×1916813648² = 7348349122318135808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15383 + ... + 63798.

It is an arithmetic number, because the mean of its divisors is an integer number (99413001).

Almost surely, 2^1916813648 is an apocalyptic number.

It is an amenable number.

1916813648 is an abundant number, since it is smaller than the sum of its proper divisors (2059706392).

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

1916813648 is a wasteful number, since it uses less digits than its factorization.

1916813648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79295 (or 79289 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 1916813648 is about 43781.4304014841. The cubic root of 1916813648 is about 1242.2050705402.

The spelling of 1916813648 in words is "one billion, nine hundred sixteen million, eight hundred thirteen thousand, six hundred forty-eight".