981787572 has 36 divisors (see below), whose sum is σ = 2482929540. Its totient is φ = 327105792.

The previous prime is 981787561. The next prime is 981787579. The reversal of 981787572 is 275787189.

It is a happy number.

981787572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 779749776 + 202037796 = 27924^2 + 14214^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981787579) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88698 + ... + 99150.

It is an arithmetic number, because the mean of its divisors is an integer number (68970265).

Almost surely, 2^981787572 is an apocalyptic number.

It is an amenable number.

981787572 is an abundant number, since it is smaller than the sum of its proper divisors (1501141968).

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

981787572 is a wasteful number, since it uses less digits than its factorization.

981787572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13072 (or 13067 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 54.

The square root of 981787572 is about 31333.4896237237. The cubic root of 981787572 is about 993.8919584551.

The spelling of 981787572 in words is "nine hundred eighty-one million, seven hundred eighty-seven thousand, five hundred seventy-two".