2078668477 has 4 divisors (see below), whose sum is σ = 2097738940. Its totient is φ = 2059598016.

The previous prime is 2078668463. The next prime is 2078668481. The reversal of 2078668477 is 7748668702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1494672921 + 583995556 = 38661^2 + 24166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2078668477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078638477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9535068 + ... + 9535285.

It is an arithmetic number, because the mean of its divisors is an integer number (524434735).

Almost surely, 2^2078668477 is an apocalyptic number.

It is an amenable number.

2078668477 is a deficient number, since it is larger than the sum of its proper divisors (19070463).

2078668477 is a wasteful number, since it uses less digits than its factorization.

2078668477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19070462.

The product of its (nonzero) digits is 6322176, while the sum is 55.

The square root of 2078668477 is about 45592.4168804419. The cubic root of 2078668477 is about 1276.2284153694.

The spelling of 2078668477 in words is "two billion, seventy-eight million, six hundred sixty-eight thousand, four hundred seventy-seven".