1978067740 has 48 divisors (see below), whose sum is σ = 4605892704. Its totient is φ = 707500800.

The previous prime is 1978067719. The next prime is 1978067771. The reversal of 1978067740 is 477608791.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60279 + ... + 87118.

It is an arithmetic number, because the mean of its divisors is an integer number (95956098).

Almost surely, 2^1978067740 is an apocalyptic number.

1978067740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978067740 is an abundant number, since it is smaller than the sum of its proper divisors (2627824964).

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

1978067740 is a wasteful number, since it uses less digits than its factorization.

1978067740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147478 (or 147476 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 1978067740 is about 44475.4734657204. The cubic root of 1978067740 is about 1255.2986257828.

The spelling of 1978067740 in words is "one billion, nine hundred seventy-eight million, sixty-seven thousand, seven hundred forty".