66642480 has 80 divisors (see below), whose sum is σ = 229553760. Its totient is φ = 17770752.

The previous prime is 66642473. The next prime is 66642497. The reversal of 66642480 is 8424666.

It is a happy number.

66642480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13267 + ... + 17586.

It is an arithmetic number, because the mean of its divisors is an integer number (2869422).

Almost surely, 2^66642480 is an apocalyptic number.

66642480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66642480 is an abundant number, since it is smaller than the sum of its proper divisors (162911280).

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

66642480 is a wasteful number, since it uses less digits than its factorization.

66642480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30875 (or 30863 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 66642480 is about 8163.4845501171. The cubic root of 66642480 is about 405.4310910428.

The spelling of 66642480 in words is "sixty-six million, six hundred forty-two thousand, four hundred eighty".