78955957 has 2 divisors, whose sum is σ = 78955958. Its totient is φ = 78955956.

The previous prime is 78955909. The next prime is 78955969. The reversal of 78955957 is 75955987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57062916 + 21893041 = 7554^2 + 4679^2 .

It is a cyclic number.

It is not a de Polignac number, because 78955957 - 2⁷ = 78955829 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78955898 and 78955907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78955057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39477978 + 39477979.

It is an arithmetic number, because the mean of its divisors is an integer number (39477979).

Almost surely, 2^78955957 is an apocalyptic number.

It is an amenable number.

78955957 is a deficient number, since it is larger than the sum of its proper divisors (1).

78955957 is an equidigital number, since it uses as much as digits as its factorization.

78955957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3969000, while the sum is 55.

The square root of 78955957 is about 8885.7164595771. The cubic root of 78955957 is about 429.0042888565.

The spelling of 78955957 in words is "seventy-eight million, nine hundred fifty-five thousand, nine hundred fifty-seven".