66757480 has 32 divisors (see below), whose sum is σ = 150854400. Its totient is φ = 26587456.

The previous prime is 66757459. The next prime is 66757489. The reversal of 66757480 is 8475766.

It is a super-2 number, since 2×66757480² = 8913122271900800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66757489) 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, 6069 + ... + 13051.

It is an arithmetic number, because the mean of its divisors is an integer number (4714200).

Almost surely, 2^66757480 is an apocalyptic number.

It is an amenable number.

66757480 is an abundant number, since it is smaller than the sum of its proper divisors (84096920).

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

66757480 is a wasteful number, since it uses less digits than its factorization.

66757480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7233 (or 7229 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 66757480 is about 8170.5250749263. The cubic root of 66757480 is about 405.6641645134.

The spelling of 66757480 in words is "sixty-six million, seven hundred fifty-seven thousand, four hundred eighty".