66077220 has 96 divisors (see below), whose sum is σ = 205752960. Its totient is φ = 15708160.

The previous prime is 66077189. The next prime is 66077233. The reversal of 66077220 is 2277066.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34036 + ... + 35924.

It is an arithmetic number, because the mean of its divisors is an integer number (2143260).

Almost surely, 2^66077220 is an apocalyptic number.

66077220 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 66077220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102876480).

66077220 is an abundant number, since it is smaller than the sum of its proper divisors (139675740).

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

66077220 is a wasteful number, since it uses less digits than its factorization.

66077220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965 (or 1963 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 66077220 is about 8128.7895777908. The cubic root of 66077220 is about 404.2815489957.

The spelling of 66077220 in words is "sixty-six million, seventy-seven thousand, two hundred twenty".