66532440 has 64 divisors (see below), whose sum is σ = 214956000. Its totient is φ = 16376832.

The previous prime is 66532429. The next prime is 66532447. The reversal of 66532440 is 4423566.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66532398 and 66532407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66532447) 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, 19765 + ... + 22884.

Almost surely, 2^66532440 is an apocalyptic number.

66532440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66532440 is an abundant number, since it is smaller than the sum of its proper divisors (148423560).

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

66532440 is a wasteful number, since it uses less digits than its factorization.

66532440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42676 (or 42672 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 66532440 is about 8156.7419966553. The cubic root of 66532440 is about 405.2078189640.

The spelling of 66532440 in words is "sixty-six million, five hundred thirty-two thousand, four hundred forty".