78863977 has 2 divisors, whose sum is σ = 78863978. Its totient is φ = 78863976.

The previous prime is 78863957. The next prime is 78864001. The reversal of 78863977 is 77936887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67174416 + 11689561 = 8196^2 + 3419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78863977 is a prime.

It is not a weakly prime, because it can be changed into another prime (78863957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39431988 + 39431989.

It is an arithmetic number, because the mean of its divisors is an integer number (39431989).

Almost surely, 2^78863977 is an apocalyptic number.

It is an amenable number.

78863977 is a deficient number, since it is larger than the sum of its proper divisors (1).

78863977 is an equidigital number, since it uses as much as digits as its factorization.

78863977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 55.

The square root of 78863977 is about 8880.5392291234. The cubic root of 78863977 is about 428.8376341423.

The spelling of 78863977 in words is "seventy-eight million, eight hundred sixty-three thousand, nine hundred seventy-seven".