66277988 has 18 divisors (see below), whose sum is σ = 134923446. Its totient is φ = 28404768.

The previous prime is 66277979. The next prime is 66277999. The reversal of 66277988 is 88977266.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 50580544 + 15697444 = 7112^2 + 3962^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168881 + ... + 169272.

It is an arithmetic number, because the mean of its divisors is an integer number (7495747).

Almost surely, 2^66277988 is an apocalyptic number.

It is an amenable number.

66277988 is an abundant number, since it is smaller than the sum of its proper divisors (68645458).

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

66277988 is a wasteful number, since it uses less digits than its factorization.

66277988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338171 (or 338162 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 53.

The square root of 66277988 is about 8141.1294056783. The cubic root of 66277988 is about 404.6905892630.

The spelling of 66277988 in words is "sixty-six million, two hundred seventy-seven thousand, nine hundred eighty-eight".