66572780 has 24 divisors (see below), whose sum is σ = 139987008. Its totient is φ = 26594048.

The previous prime is 66572773. The next prime is 66572783. The reversal of 66572780 is 8727566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66572783) 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, 17837 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (5832792).

Almost surely, 2^66572780 is an apocalyptic number.

It is an amenable number.

66572780 is an abundant number, since it is smaller than the sum of its proper divisors (73414228).

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

66572780 is a wasteful number, since it uses less digits than its factorization.

66572780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393 (or 4391 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 66572780 is about 8159.2144229699. The cubic root of 66572780 is about 405.2896977231.

The spelling of 66572780 in words is "sixty-six million, five hundred seventy-two thousand, seven hundred eighty".