66477040 has 40 divisors (see below), whose sum is σ = 176640480. Its totient is φ = 22791936.

The previous prime is 66477017. The next prime is 66477041. The reversal of 66477040 is 4077466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 66476987 and 66477005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66477041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58795 + ... + 59914.

It is an arithmetic number, because the mean of its divisors is an integer number (4416012).

Almost surely, 2^66477040 is an apocalyptic number.

It is an amenable number.

66477040 is an abundant number, since it is smaller than the sum of its proper divisors (110163440).

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

66477040 is a wasteful number, since it uses less digits than its factorization.

66477040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118729 (or 118723 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 66477040 is about 8153.3453256930. The cubic root of 66477040 is about 405.0953187219.

The spelling of 66477040 in words is "sixty-six million, four hundred seventy-seven thousand, forty".