1987678790 has 16 divisors (see below), whose sum is σ = 3590559360. Its totient is φ = 792240960.

The previous prime is 1987678783. The next prime is 1987678817. The reversal of 1987678790 is 978767891.

It is a congruent number.

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, 350870 + ... + 356489.

It is an arithmetic number, because the mean of its divisors is an integer number (224409960).

Almost surely, 2^1987678790 is an apocalyptic number.

1987678790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987678790 is a deficient number, since it is larger than the sum of its proper divisors (1602880570).

1987678790 is a wasteful number, since it uses less digits than its factorization.

1987678790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707647.

The product of its (nonzero) digits is 10668672, while the sum is 62.

The square root of 1987678790 is about 44583.3914142924. The cubic root of 1987678790 is about 1257.3284265677.

The spelling of 1987678790 in words is "one billion, nine hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred ninety".