78105229 has 4 divisors (see below), whose sum is σ = 78146080. Its totient is φ = 78064380.

The previous prime is 78105221. The next prime is 78105239. The reversal of 78105229 is 92250187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92250187 = 19 ⋅4855273.

It is a cyclic number.

It is not a de Polignac number, because 78105229 - 2³ = 78105221 is a prime.

It is a super-2 number, since 2×78105229² = 12200853594284882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78105194 and 78105203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78105221) 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, 17409 + ... + 21430.

It is an arithmetic number, because the mean of its divisors is an integer number (19536520).

Almost surely, 2^78105229 is an apocalyptic number.

It is an amenable number.

78105229 is a deficient number, since it is larger than the sum of its proper divisors (40851).

78105229 is a wasteful number, since it uses less digits than its factorization.

78105229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40850.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 78105229 is about 8837.7162774101. The cubic root of 78105229 is about 427.4579218300.

The spelling of 78105229 in words is "seventy-eight million, one hundred five thousand, two hundred twenty-nine".