678019977 has 10 divisors (see below), whose sum is σ = 1012844778. Its totient is φ = 452013264.

The previous prime is 678019973. The next prime is 678019999. The reversal of 678019977 is 779910876.

It can be written as a sum of positive squares in only one way, i.e., 645973056 + 32046921 = 25416^2 + 5661^2 .

It is not a de Polignac number, because 678019977 - 2² = 678019973 is a prime.

It is a super-2 number, since 2×678019977² = 919422178422161058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678019973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4185228 + ... + 4185389.

Almost surely, 2^678019977 is an apocalyptic number.

It is an amenable number.

678019977 is a deficient number, since it is larger than the sum of its proper divisors (334824801).

678019977 is an equidigital number, since it uses as much as digits as its factorization.

678019977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8370629 (or 8370620 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The square root of 678019977 is about 26038.8167357889. The cubic root of 678019977 is about 878.5115925256.

The spelling of 678019977 in words is "six hundred seventy-eight million, nineteen thousand, nine hundred seventy-seven".