66640024 has 48 divisors (see below), whose sum is σ = 140623560. Its totient is φ = 29568000.

The previous prime is 66640019. The next prime is 66640043. The reversal of 66640024 is 42004666.

It is a junction number, because it is equal to n+sod(n) for n = 66639974 and 66640001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40824 + ... + 42424.

Almost surely, 2^66640024 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 66640024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70311780).

66640024 is an abundant number, since it is smaller than the sum of its proper divisors (73983536).

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

66640024 is a wasteful number, since it uses less digits than its factorization.

66640024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66640024 is about 8163.3341227712. The cubic root of 66640024 is about 405.4261104809.

The spelling of 66640024 in words is "sixty-six million, six hundred forty thousand, twenty-four".