1988671730 has 16 divisors (see below), whose sum is σ = 3790174680. Its totient is φ = 748676352.

The previous prime is 1988671717. The next prime is 1988671739. The reversal of 1988671730 is 371768891.

It can be written as a sum of positive squares in 4 ways, for example, as 1947545161 + 41126569 = 44131^2 + 6413^2 .

It is not an unprimeable number, because it can be changed into a prime (1988671739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5848865 + ... + 5849204.

Almost surely, 2^1988671730 is an apocalyptic number.

1988671730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1988671730 is a deficient number, since it is larger than the sum of its proper divisors (1801502950).

1988671730 is a wasteful number, since it uses less digits than its factorization.

1988671730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11698093.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 1988671730 is about 44594.5257851230. The cubic root of 1988671730 is about 1257.5377568117.

The spelling of 1988671730 in words is "one billion, nine hundred eighty-eight million, six hundred seventy-one thousand, seven hundred thirty".