1978320778470 has 96 divisors (see below), whose sum is σ = 5367760062912. Its totient is φ = 504569108736.

The previous prime is 1978320778457. The next prime is 1978320778471. The reversal of 1978320778470 is 748770238791.

1978320778470 is a `hidden beast` number, since 1 + 9 + 78 + 3 + 20 + 7 + 78 + 470 = 666.

It is a super-2 number, since 2×1978320778470² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1978320778398 and 1978320778407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978320778471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26568532 + ... + 26642888.

It is an arithmetic number, because the mean of its divisors is an integer number (55914167322).

Almost surely, 2^{1978320778470} is an apocalyptic number.

1978320778470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978320778470 is an abundant number, since it is smaller than the sum of its proper divisors (3389439284442).

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

1978320778470 is a wasteful number, since it uses less digits than its factorization.

1978320778470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87246 (or 87243 counting only the distinct ones).

The product of its (nonzero) digits is 33191424, while the sum is 63.

The spelling of 1978320778470 in words is "one trillion, nine hundred seventy-eight billion, three hundred twenty million, seven hundred seventy-eight thousand, four hundred seventy".