1999880578 has 24 divisors (see below), whose sum is σ = 3206362032. Its totient is φ = 935302464.

The previous prime is 1999880569. The next prime is 1999880581. The reversal of 1999880578 is 8750889991.

It is a super-2 number, since 2×1999880578² = 7999044652523228168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83601 + ... + 104827.

It is an arithmetic number, because the mean of its divisors is an integer number (133598418).

Almost surely, 2^1999880578 is an apocalyptic number.

1999880578 is a deficient number, since it is larger than the sum of its proper divisors (1206481454).

1999880578 is a wasteful number, since it uses less digits than its factorization.

1999880578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21426 (or 21409 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 64.

The square root of 1999880578 is about 44720.0243515139. The cubic root of 1999880578 is about 1259.8959723471.

It can be divided in two parts, 19998 and 80578, that added together give a triangular number (100576 = T₄₄₈).

The spelling of 1999880578 in words is "one billion, nine hundred ninety-nine million, eight hundred eighty thousand, five hundred seventy-eight".