78860149 has 2 divisors, whose sum is σ = 78860150. Its totient is φ = 78860148.

The previous prime is 78860143. The next prime is 78860153. The reversal of 78860149 is 94106887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59013124 + 19847025 = 7682^2 + 4455^2 .

It is a cyclic number.

It is not a de Polignac number, because 78860149 - 2¹⁵ = 78827381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78860143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39430074 + 39430075.

It is an arithmetic number, because the mean of its divisors is an integer number (39430075).

Almost surely, 2^78860149 is an apocalyptic number.

It is an amenable number.

78860149 is a deficient number, since it is larger than the sum of its proper divisors (1).

78860149 is an equidigital number, since it uses as much as digits as its factorization.

78860149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 78860149 is about 8880.3236990551. The cubic root of 78860149 is about 428.8306955412.

The spelling of 78860149 in words is "seventy-eight million, eight hundred sixty thousand, one hundred forty-nine".