1648777340 has 48 divisors (see below), whose sum is σ = 3964004352. Its totient is φ = 564303936.

The previous prime is 1648777297. The next prime is 1648777349. The reversal of 1648777340 is 437778461.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648777349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72149 + ... + 92211.

It is an arithmetic number, because the mean of its divisors is an integer number (82583424).

Almost surely, 2^1648777340 is an apocalyptic number.

1648777340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1648777340 is an abundant number, since it is smaller than the sum of its proper divisors (2315227012).

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

1648777340 is a wasteful number, since it uses less digits than its factorization.

1648777340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20666 (or 20664 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 47.

The square root of 1648777340 is about 40605.1393298927. The cubic root of 1648777340 is about 1181.3738045168.

The spelling of 1648777340 in words is "one billion, six hundred forty-eight million, seven hundred seventy-seven thousand, three hundred forty".