66674140 has 48 divisors (see below), whose sum is σ = 152339040. Its totient is φ = 24364800.

The previous prime is 66674137. The next prime is 66674143. The reversal of 66674140 is 4147666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66674137) and next prime (66674143).

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66674096 and 66674105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66674143) 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, 24991 + ... + 27529.

It is an arithmetic number, because the mean of its divisors is an integer number (3173730).

Almost surely, 2^66674140 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 66674140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76169520).

66674140 is an abundant number, since it is smaller than the sum of its proper divisors (85664900).

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

66674140 is a wasteful number, since it uses less digits than its factorization.

66674140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662 (or 2660 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 66674140 is about 8165.4234427861. The cubic root of 66674140 is about 405.4952839131.

The spelling of 66674140 in words is "sixty-six million, six hundred seventy-four thousand, one hundred forty".