66640352 has 24 divisors (see below), whose sum is σ = 132678000. Its totient is φ = 32944384.

The previous prime is 66640339. The next prime is 66640363. The reversal of 66640352 is 25304666.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8852 + ... + 14547.

It is an arithmetic number, because the mean of its divisors is an integer number (5528250).

Almost surely, 2^66640352 is an apocalyptic number.

It is an amenable number.

66640352 is a deficient number, since it is larger than the sum of its proper divisors (66037648).

66640352 is a wasteful number, since it uses less digits than its factorization.

66640352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23498 (or 23490 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66640352 is about 8163.3542125771. The cubic root of 66640352 is about 405.4267756445.

The spelling of 66640352 in words is "sixty-six million, six hundred forty thousand, three hundred fifty-two".