981779072 has 32 divisors (see below), whose sum is σ = 1962871680. Its totient is φ = 489136896.

The previous prime is 981779069. The next prime is 981779093. The reversal of 981779072 is 270977189.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 981779072.

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, 22673 + ... + 49775.

It is an arithmetic number, because the mean of its divisors is an integer number (61339740).

Almost surely, 2^981779072 is an apocalyptic number.

It is an amenable number.

981779072 is a deficient number, since it is larger than the sum of its proper divisors (981092608).

981779072 is a wasteful number, since it uses less digits than its factorization.

981779072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27400 (or 27388 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 50.

The square root of 981779072 is about 31333.3539858088. The cubic root of 981779072 is about 993.8890901815.

The spelling of 981779072 in words is "nine hundred eighty-one million, seven hundred seventy-nine thousand, seventy-two".