78672953 has 2 divisors, whose sum is σ = 78672954. Its totient is φ = 78672952.

The previous prime is 78672943. The next prime is 78672959. The reversal of 78672953 is 35927687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52591504 + 26081449 = 7252^2 + 5107^2 .

78672953 is a truncatable prime.

It is an emirp because it is prime and its reverse (35927687) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78672953 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78672898 and 78672907.

It is not a weakly prime, because it can be changed into another prime (78672959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39336476 + 39336477.

It is an arithmetic number, because the mean of its divisors is an integer number (39336477).

Almost surely, 2^78672953 is an apocalyptic number.

It is an amenable number.

78672953 is a deficient number, since it is larger than the sum of its proper divisors (1).

78672953 is an equidigital number, since it uses as much as digits as its factorization.

78672953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 78672953 is about 8869.7775056650. Note that the first 3 decimals coincide. The cubic root of 78672953 is about 428.4911112928.

It can be divided in two parts, 7867295 and 3, that multiplied together give a triangular number (23601885 = T₆₈₇₀).

The spelling of 78672953 in words is "seventy-eight million, six hundred seventy-two thousand, nine hundred fifty-three".