66763788 has 72 divisors (see below), whose sum is σ = 192826368. Its totient is φ = 17604288.

The previous prime is 66763787. The next prime is 66763793. The reversal of 66763788 is 88736766.

It is a self number, because there is not a number n which added to its sum of digits gives 66763788.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66763783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11845 + ... + 16547.

It is an arithmetic number, because the mean of its divisors is an integer number (2678144).

Almost surely, 2^66763788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66763788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96413184).

66763788 is an abundant number, since it is smaller than the sum of its proper divisors (126062580).

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

66763788 is a wasteful number, since it uses less digits than its factorization.

66763788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743 (or 4728 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 51.

The square root of 66763788 is about 8170.9110875104. The cubic root of 66763788 is about 405.6769413535.

The spelling of 66763788 in words is "sixty-six million, seven hundred sixty-three thousand, seven hundred eighty-eight".