66773776 has 20 divisors (see below), whose sum is σ = 133836300. Its totient is φ = 32235392.

The previous prime is 66773731. The next prime is 66773779. The reversal of 66773776 is 67737766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27836176 + 38937600 = 5276^2 + 6240^2 .

It is a super-2 number, since 2×66773776² = 8917474322596352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66773779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71491 + ... + 72418.

It is an arithmetic number, because the mean of its divisors is an integer number (6691815).

Almost surely, 2^66773776 is an apocalyptic number.

It is an amenable number.

66773776 is an abundant number, since it is smaller than the sum of its proper divisors (67062524).

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

66773776 is a wasteful number, since it uses less digits than its factorization.

66773776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143946 (or 143940 counting only the distinct ones).

The product of its digits is 1555848, while the sum is 49.

The square root of 66773776 is about 8171.5222572052. The cubic root of 66773776 is about 405.6971703797.

The spelling of 66773776 in words is "sixty-six million, seven hundred seventy-three thousand, seven hundred seventy-six".