1649869870 has 16 divisors (see below), whose sum is σ = 3239744688. Its totient is φ = 599952640.

The previous prime is 1649869829. The next prime is 1649869909. The reversal of 1649869870 is 789689461.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 7499299 + ... + 7499518.

It is an arithmetic number, because the mean of its divisors is an integer number (202484043).

Almost surely, 2^1649869870 is an apocalyptic number.

1649869870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1649869870 is a deficient number, since it is larger than the sum of its proper divisors (1589874818).

1649869870 is a wasteful number, since it uses less digits than its factorization.

1649869870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14998835.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 1649869870 is about 40618.5902020245. The cubic root of 1649869870 is about 1181.6346849712.

It can be divided in two parts, 16498 and 69870, that added together give a palindrome (86368).

The spelling of 1649869870 in words is "one billion, six hundred forty-nine million, eight hundred sixty-nine thousand, eight hundred seventy".