1649345776 has 20 divisors (see below), whose sum is σ = 3441423832. Its totient is φ = 761236416.

The previous prime is 1649345773. The next prime is 1649345779. The reversal of 1649345776 is 6775439461.

It is an interprime number because it is at equal distance from previous prime (1649345773) and next prime (1649345779).

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649345771) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3964566 + ... + 3964981.

Almost surely, 2^1649345776 is an apocalyptic number.

1649345776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1649345776 is an abundant number, since it is smaller than the sum of its proper divisors (1792078056).

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

1649345776 is a wasteful number, since it uses less digits than its factorization.

1649345776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7929568 (or 7929562 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 52.

The square root of 1649345776 is about 40612.1382840155. The cubic root of 1649345776 is about 1181.5095532370.

The spelling of 1649345776 in words is "one billion, six hundred forty-nine million, three hundred forty-five thousand, seven hundred seventy-six".