1787920655 has 16 divisors (see below), whose sum is σ = 2196733824. Its totient is φ = 1396339200.

The previous prime is 1787920649. The next prime is 1787920657. The reversal of 1787920655 is 5560297871.

It is not a de Polignac number, because 1787920655 - 2⁴ = 1787920639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1787920657) 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 15 ways as a sum of consecutive naturals, for example, 84749 + ... + 103721.

It is an arithmetic number, because the mean of its divisors is an integer number (137295864).

Almost surely, 2^1787920655 is an apocalyptic number.

1787920655 is a deficient number, since it is larger than the sum of its proper divisors (408813169).

1787920655 is a wasteful number, since it uses less digits than its factorization.

1787920655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19426.

The product of its (nonzero) digits is 1058400, while the sum is 50.

The square root of 1787920655 is about 42283.8107908925. The cubic root of 1787920655 is about 1213.7132148286.

The spelling of 1787920655 in words is "one billion, seven hundred eighty-seven million, nine hundred twenty thousand, six hundred fifty-five".