66963780 has 96 divisors (see below), whose sum is σ = 224380800. Its totient is φ = 16481664.

The previous prime is 66963779. The next prime is 66963781. The reversal of 66963780 is 8736966.

66963780 is a `hidden beast` number, since 6 + 6 + 9 + 637 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (66963779) and next prime (66963781).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66963781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2251 + ... + 11789.

It is an arithmetic number, because the mean of its divisors is an integer number (2337300).

Almost surely, 2^66963780 is an apocalyptic number.

66963780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66963780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112190400).

66963780 is an abundant number, since it is smaller than the sum of its proper divisors (157417020).

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

66963780 is a wasteful number, since it uses less digits than its factorization.

66963780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9570 (or 9562 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66963780 is about 8183.1399841381. The cubic root of 66963780 is about 406.0816081594.

The spelling of 66963780 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred eighty".