1990878688 has 24 divisors (see below), whose sum is σ = 3928879080. Its totient is φ = 993068160.

The previous prime is 1990878679. The next prime is 1990878707. The reversal of 1990878688 is 8868780991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60418 + ... + 87361.

It is an arithmetic number, because the mean of its divisors is an integer number (163703295).

Almost surely, 2^1990878688 is an apocalyptic number.

It is an amenable number.

1990878688 is a deficient number, since it is larger than the sum of its proper divisors (1938000392).

1990878688 is a wasteful number, since it uses less digits than its factorization.

1990878688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148210 (or 148202 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 64.

The square root of 1990878688 is about 44619.2636425121. The cubic root of 1990878688 is about 1258.0027752371.

It can be divided in two parts, 19908 and 78688, that added together give a square (98596 = 314²).

The spelling of 1990878688 in words is "one billion, nine hundred ninety million, eight hundred seventy-eight thousand, six hundred eighty-eight".