1978388760 has 32 divisors (see below), whose sum is σ = 5935166640. Its totient is φ = 527570304.

The previous prime is 1978388701. The next prime is 1978388771. The reversal of 1978388760 is 678838791.

It is a self number, because there is not a number n which added to its sum of digits gives 1978388760.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8243167 + ... + 8243406.

Almost surely, 2^1978388760 is an apocalyptic number.

1978388760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978388760 is an abundant number, since it is smaller than the sum of its proper divisors (3956777880).

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

1978388760 is a wasteful number, since it uses less digits than its factorization.

1978388760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16486587 (or 16486583 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The square root of 1978388760 is about 44479.0822747053. The cubic root of 1978388760 is about 1255.3665294511.

The spelling of 1978388760 in words is "one billion, nine hundred seventy-eight million, three hundred eighty-eight thousand, seven hundred sixty".