65173428 has 72 divisors (see below), whose sum is σ = 171088008. Its totient is φ = 20901888.

The previous prime is 65173403. The next prime is 65173429. The reversal of 65173428 is 82437156.

65173428 is a `hidden beast` number, since 65 + 173 + 428 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 338724 + 64834704 = 582^2 + 8052^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65173392 and 65173401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65173429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150300 + ... + 150732.

Almost surely, 2^65173428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65173428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85544004).

65173428 is an abundant number, since it is smaller than the sum of its proper divisors (105914580).

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

65173428 is a wasteful number, since it uses less digits than its factorization.

65173428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 588 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 65173428 is about 8073.0061315473. The cubic root of 65173428 is about 402.4298513348.

The spelling of 65173428 in words is "sixty-five million, one hundred seventy-three thousand, four hundred twenty-eight".