66978252 has 60 divisors (see below), whose sum is σ = 191022216. Its totient is φ = 20295360.

The previous prime is 66978217. The next prime is 66978269. The reversal of 66978252 is 25287966.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66978198 and 66978207.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5833 + ... + 12960.

Almost surely, 2^66978252 is an apocalyptic number.

It is an amenable number.

66978252 is an abundant number, since it is smaller than the sum of its proper divisors (124043964).

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

66978252 is a wasteful number, since it uses less digits than its factorization.

66978252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18820 (or 18809 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66978252 is about 8184.0241935126. The cubic root of 66978252 is about 406.1108597425.

The spelling of 66978252 in words is "sixty-six million, nine hundred seventy-eight thousand, two hundred fifty-two".