2078578657 has 2 divisors, whose sum is σ = 2078578658. Its totient is φ = 2078578656.

The previous prime is 2078578651. The next prime is 2078578699. The reversal of 2078578657 is 7568758702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1950458896 + 128119761 = 44164^2 + 11319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2078578657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2078578598 and 2078578607.

It is not a weakly prime, because it can be changed into another prime (2078578651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039289328 + 1039289329.

It is an arithmetic number, because the mean of its divisors is an integer number (1039289329).

Almost surely, 2^2078578657 is an apocalyptic number.

It is an amenable number.

2078578657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2078578657 is an equidigital number, since it uses as much as digits as its factorization.

2078578657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6585600, while the sum is 55.

The square root of 2078578657 is about 45591.4318375723. The cubic root of 2078578657 is about 1276.2100330109.

The spelling of 2078578657 in words is "two billion, seventy-eight million, five hundred seventy-eight thousand, six hundred fifty-seven".