78975983 has 2 divisors, whose sum is σ = 78975984. Its totient is φ = 78975982.

The previous prime is 78975977. The next prime is 78976013. The reversal of 78975983 is 38957987.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78975983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78975943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39487991 + 39487992.

It is an arithmetic number, because the mean of its divisors is an integer number (39487992).

Almost surely, 2^78975983 is an apocalyptic number.

78975983 is a deficient number, since it is larger than the sum of its proper divisors (1).

78975983 is an equidigital number, since it uses as much as digits as its factorization.

78975983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 78975983 is about 8886.8432528092. The cubic root of 78975983 is about 429.0405559687.

The spelling of 78975983 in words is "seventy-eight million, nine hundred seventy-five thousand, nine hundred eighty-three".