66528340 has 12 divisors (see below), whose sum is σ = 139709556. Its totient is φ = 26611328.

The previous prime is 66528337. The next prime is 66528347. The reversal of 66528340 is 4382566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47969476 + 18558864 = 6926^2 + 4308^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66528296 and 66528305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66528347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663189 + ... + 1663228.

It is an arithmetic number, because the mean of its divisors is an integer number (11642463).

Almost surely, 2^66528340 is an apocalyptic number.

It is an amenable number.

66528340 is an abundant number, since it is smaller than the sum of its proper divisors (73181216).

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

66528340 is a wasteful number, since it uses less digits than its factorization.

66528340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326426 (or 3326424 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 66528340 is about 8156.4906669474. The cubic root of 66528340 is about 405.1994952742.

The spelling of 66528340 in words is "sixty-six million, five hundred twenty-eight thousand, three hundred forty".