8180128772 has 12 divisors (see below), whose sum is σ = 14316242640. Its totient is φ = 4089773736.

The previous prime is 8180128741. The next prime is 8180128787. The reversal of 8180128772 is 2778210818.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1622 + ... + 127917.

It is an arithmetic number, because the mean of its divisors is an integer number (1193020220).

Almost surely, 2^8180128772 is an apocalyptic number.

It is an amenable number.

8180128772 is a deficient number, since it is larger than the sum of its proper divisors (6136113868).

8180128772 is a wasteful number, since it uses less digits than its factorization.

8180128772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145330 (or 145328 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 44.

The square root of 8180128772 is about 90444.0643270746. The cubic root of 8180128772 is about 2014.8994584368.

The spelling of 8180128772 in words is "eight billion, one hundred eighty million, one hundred twenty-eight thousand, seven hundred seventy-two".