66984940 has 24 divisors (see below), whose sum is σ = 153456912. Its totient is φ = 24358080.

The previous prime is 66984923. The next prime is 66984941. The reversal of 66984940 is 4948966.

It is not an unprimeable number, because it can be changed into a prime (66984941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152019 + ... + 152458.

It is an arithmetic number, because the mean of its divisors is an integer number (6394038).

Almost surely, 2^66984940 is an apocalyptic number.

It is an amenable number.

66984940 is an abundant number, since it is smaller than the sum of its proper divisors (86471972).

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

66984940 is a wasteful number, since it uses less digits than its factorization.

66984940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304497 (or 304495 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 66984940 is about 8184.4327842557. The cubic root of 66984940 is about 406.1243764635.

The spelling of 66984940 in words is "sixty-six million, nine hundred eighty-four thousand, nine hundred forty".