1171980728 has 8 divisors (see below), whose sum is σ = 2197463880. Its totient is φ = 585990360.

The previous prime is 1171980707. The next prime is 1171980769. The reversal of 1171980728 is 8270891711.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73248788 + ... + 73248803.

It is an arithmetic number, because the mean of its divisors is an integer number (274682985).

Almost surely, 2^1171980728 is an apocalyptic number.

It is an amenable number.

1171980728 is a deficient number, since it is larger than the sum of its proper divisors (1025483152).

1171980728 is a wasteful number, since it uses less digits than its factorization.

1171980728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146497597 (or 146497593 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 44.

The square root of 1171980728 is about 34234.2040655249. The cubic root of 1171980728 is about 1054.3225371444.

The spelling of 1171980728 in words is "one billion, one hundred seventy-one million, nine hundred eighty thousand, seven hundred twenty-eight".