78104149 has 4 divisors (see below), whose sum is σ = 78215020. Its totient is φ = 77993280.

The previous prime is 78104123. The next prime is 78104153. The reversal of 78104149 is 94140187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94140187 = 113 ⋅833099.

It can be written as a sum of positive squares in 2 ways, for example, as 3972049 + 74132100 = 1993^2 + 8610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78104149 is a prime.

It is a super-2 number, since 2×78104149² = 12200516182028402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78104119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54372 + ... + 55789.

It is an arithmetic number, because the mean of its divisors is an integer number (19553755).

Almost surely, 2^78104149 is an apocalyptic number.

It is an amenable number.

78104149 is a deficient number, since it is larger than the sum of its proper divisors (110871).

78104149 is a wasteful number, since it uses less digits than its factorization.

78104149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110870.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 78104149 is about 8837.6551754411. The cubic root of 78104149 is about 427.4559515962.

The spelling of 78104149 in words is "seventy-eight million, one hundred four thousand, one hundred forty-nine".