66402532 has 24 divisors (see below), whose sum is σ = 132977600. Its totient is φ = 28421280.

The previous prime is 66402521. The next prime is 66402533. The reversal of 66402532 is 23520466.

It is a happy number.

It is a super-2 number, since 2×66402532² = 8818592512022048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 66402532.

It is not an unprimeable number, because it can be changed into a prime (66402533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42094 + ... + 43642.

Almost surely, 2^66402532 is an apocalyptic number.

It is an amenable number.

66402532 is an abundant number, since it is smaller than the sum of its proper divisors (66575068).

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

66402532 is a wasteful number, since it uses less digits than its factorization.

66402532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091 (or 3089 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66402532 is about 8148.7748772438. The cubic root of 66402532 is about 404.9439174490.

Adding to 66402532 its reverse (23520466), we get a palindrome (89922998).

The spelling of 66402532 in words is "sixty-six million, four hundred two thousand, five hundred thirty-two".