1649778240 has 112 divisors (see below), whose sum is σ = 5714268480. Its totient is φ = 399943680.

The previous prime is 1649778203. The next prime is 1649778259. The reversal of 1649778240 is 428779461.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1649778240.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 67555 + ... + 88674.

Almost surely, 2^1649778240 is an apocalyptic number.

1649778240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649778240 is an abundant number, since it is smaller than the sum of its proper divisors (4064490240).

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

1649778240 is a wasteful number, since it uses less digits than its factorization.

1649778240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156260 (or 156250 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The square root of 1649778240 is about 40617.4622545525. The cubic root of 1649778240 is about 1181.6128094701.

The spelling of 1649778240 in words is "one billion, six hundred forty-nine million, seven hundred seventy-eight thousand, two hundred forty".