66488778 has 24 divisors (see below), whose sum is σ = 147953988. Its totient is φ = 21563712.

The previous prime is 66488761. The next prime is 66488783. The reversal of 66488778 is 87788466.

It can be written as a sum of positive squares in 2 ways, for example, as 65561409 + 927369 = 8097^2 + 963^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49251 + ... + 50582.

Almost surely, 2^66488778 is an apocalyptic number.

66488778 is an abundant number, since it is smaller than the sum of its proper divisors (81465210).

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

66488778 is a wasteful number, since it uses less digits than its factorization.

66488778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99878 (or 99875 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 66488778 is about 8154.0651211528. The cubic root of 66488778 is about 405.1191601816.

The spelling of 66488778 in words is "sixty-six million, four hundred eighty-eight thousand, seven hundred seventy-eight".