1920487880 has 32 divisors (see below), whose sum is σ = 4470103800. Its totient is φ = 741705216.

The previous prime is 1920487861. The next prime is 1920487939. The reversal of 1920487880 is 887840291.

It can be written as a sum of positive squares in 4 ways, for example, as 1580380516 + 340107364 = 39754^2 + 18442^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 826637 + ... + 828956.

Almost surely, 2^1920487880 is an apocalyptic number.

1920487880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1920487880 is an abundant number, since it is smaller than the sum of its proper divisors (2549615920).

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

1920487880 is a wasteful number, since it uses less digits than its factorization.

1920487880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655633 (or 1655629 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 1920487880 is about 43823.3713901612. The cubic root of 1920487880 is about 1242.9982682294.

The spelling of 1920487880 in words is "one billion, nine hundred twenty million, four hundred eighty-seven thousand, eight hundred eighty".