1978965756 has 36 divisors (see below), whose sum is σ = 5187661752. Its totient is φ = 659654928.

The previous prime is 1978965731. The next prime is 1978965799. The reversal of 1978965756 is 6575698791.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1978965693 and 1978965702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1017015 + ... + 1018958.

Almost surely, 2^1978965756 is an apocalyptic number.

It is an amenable number.

1978965756 is an abundant number, since it is smaller than the sum of its proper divisors (3208695996).

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

1978965756 is a wasteful number, since it uses less digits than its factorization.

1978965756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035992 (or 2035978 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 63.

The square root of 1978965756 is about 44485.5679518650. The cubic root of 1978965756 is about 1255.4885599091.

The spelling of 1978965756 in words is "one billion, nine hundred seventy-eight million, nine hundred sixty-five thousand, seven hundred fifty-six".