53128989 has 12 divisors (see below), whose sum is σ = 78614172. Its totient is φ = 34555200.

The previous prime is 53128981. The next prime is 53128993. The reversal of 53128989 is 98982135.

It is a happy number.

53128989 is a `hidden beast` number, since 531 + 28 + 98 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13816089 + 39312900 = 3717^2 + 6270^2 .

It is not a de Polignac number, because 53128989 - 2³ = 53128981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53128981) 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, 71622 + ... + 72359.

It is an arithmetic number, because the mean of its divisors is an integer number (6551181).

Almost surely, 2^53128989 is an apocalyptic number.

It is an amenable number.

53128989 is a deficient number, since it is larger than the sum of its proper divisors (25485183).

53128989 is a wasteful number, since it uses less digits than its factorization.

53128989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144028 (or 144025 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 53128989 is about 7288.9635065625. The cubic root of 53128989 is about 375.9330578161.

The spelling of 53128989 in words is "fifty-three million, one hundred twenty-eight thousand, nine hundred eighty-nine".