66940788 has 24 divisors (see below), whose sum is σ = 158397120. Its totient is φ = 21999040.

The previous prime is 66940771. The next prime is 66940789. The reversal of 66940788 is 88704966.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66940789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38433 + ... + 40136.

It is an arithmetic number, because the mean of its divisors is an integer number (6599880).

Almost surely, 2^66940788 is an apocalyptic number.

It is an amenable number.

66940788 is an abundant number, since it is smaller than the sum of its proper divisors (91456332).

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

66940788 is a wasteful number, since it uses less digits than its factorization.

66940788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78647 (or 78645 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 66940788 is about 8181.7350238198. The cubic root of 66940788 is about 406.0351268272.

The spelling of 66940788 in words is "sixty-six million, nine hundred forty thousand, seven hundred eighty-eight".