66401748 has 48 divisors (see below), whose sum is σ = 196748160. Its totient is φ = 18971712.

The previous prime is 66401747. The next prime is 66401767. The reversal of 66401748 is 84710466.

66401748 is a `hidden beast` number, since 6 + 640 + 1 + 7 + 4 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66401747) 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, 43161 + ... + 44672.

It is an arithmetic number, because the mean of its divisors is an integer number (4098920).

Almost surely, 2^66401748 is an apocalyptic number.

It is an amenable number.

66401748 is an abundant number, since it is smaller than the sum of its proper divisors (130346412).

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

66401748 is a wasteful number, since it uses less digits than its factorization.

66401748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87853 (or 87845 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 66401748 is about 8148.7267717110. The cubic root of 66401748 is about 404.9423237483.

The spelling of 66401748 in words is "sixty-six million, four hundred one thousand, seven hundred forty-eight".