78108973 has 2 divisors, whose sum is σ = 78108974. Its totient is φ = 78108972.

The previous prime is 78108967. The next prime is 78108983. The reversal of 78108973 is 37980187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56746089 + 21362884 = 7533^2 + 4622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78108973 is a prime.

It is a super-2 number, since 2×78108973² = 12202023326229458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78108983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39054486 + 39054487.

It is an arithmetic number, because the mean of its divisors is an integer number (39054487).

Almost surely, 2^78108973 is an apocalyptic number.

It is an amenable number.

78108973 is a deficient number, since it is larger than the sum of its proper divisors (1).

78108973 is an equidigital number, since it uses as much as digits as its factorization.

78108973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 78108973 is about 8837.9280942990. The cubic root of 78108973 is about 427.4647518332.

The spelling of 78108973 in words is "seventy-eight million, one hundred eight thousand, nine hundred seventy-three".