981171628 has 48 divisors (see below), whose sum is σ = 1891249920. Its totient is φ = 443323584.

The previous prime is 981171623. The next prime is 981171637. The reversal of 981171628 is 826171189.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (981171623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983626 + ... + 984622.

It is an arithmetic number, because the mean of its divisors is an integer number (39401040).

Almost surely, 2^981171628 is an apocalyptic number.

It is an amenable number.

981171628 is a deficient number, since it is larger than the sum of its proper divisors (910078292).

981171628 is a wasteful number, since it uses less digits than its factorization.

981171628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1604 counting only the distinct ones).

The product of its digits is 48384, while the sum is 43.

The square root of 981171628 is about 31323.6592370687. The cubic root of 981171628 is about 993.6840689985.

The spelling of 981171628 in words is "nine hundred eighty-one million, one hundred seventy-one thousand, six hundred twenty-eight".