66942980 has 24 divisors (see below), whose sum is σ = 151394712. Its totient is φ = 24717312.

The previous prime is 66942979. The next prime is 66943021. The reversal of 66942980 is 8924966.

It can be written as a sum of positive squares in 4 ways, for example, as 2172676 + 64770304 = 1474^2 + 8048^2 .

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128477 + ... + 128996.

It is an arithmetic number, because the mean of its divisors is an integer number (6308113).

Almost surely, 2^66942980 is an apocalyptic number.

It is an amenable number.

66942980 is an abundant number, since it is smaller than the sum of its proper divisors (84451732).

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

66942980 is a wasteful number, since it uses less digits than its factorization.

66942980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257495 (or 257493 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 66942980 is about 8181.8689796403. The cubic root of 66942980 is about 406.0395587006.

The spelling of 66942980 in words is "sixty-six million, nine hundred forty-two thousand, nine hundred eighty".