78949757 has 2 divisors, whose sum is σ = 78949758. Its totient is φ = 78949756.

The previous prime is 78949727. The next prime is 78949771. The reversal of 78949757 is 75794987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56235001 + 22714756 = 7499^2 + 4766^2 .

It is an emirp because it is prime and its reverse (75794987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78949757 - 2¹⁰ = 78948733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78949727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39474878 + 39474879.

It is an arithmetic number, because the mean of its divisors is an integer number (39474879).

Almost surely, 2^78949757 is an apocalyptic number.

It is an amenable number.

78949757 is a deficient number, since it is larger than the sum of its proper divisors (1).

78949757 is an equidigital number, since it uses as much as digits as its factorization.

78949757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 56.

The square root of 78949757 is about 8885.3675782153. The cubic root of 78949757 is about 428.9930594052.

The spelling of 78949757 in words is "seventy-eight million, nine hundred forty-nine thousand, seven hundred fifty-seven".