78134047 has 4 divisors (see below), whose sum is σ = 80245816. Its totient is φ = 76022280.

The previous prime is 78134039. The next prime is 78134051. The reversal of 78134047 is 74043187.

78134047 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74043187 = 23 ⋅3219269.

It is a cyclic number.

It is not a de Polignac number, because 78134047 - 2³ = 78134039 is a prime.

It is a super-2 number, since 2×78134047² = 12209858601196418, 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 (78134087) 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, 1055829 + ... + 1055902.

It is an arithmetic number, because the mean of its divisors is an integer number (20061454).

Almost surely, 2^78134047 is an apocalyptic number.

78134047 is a deficient number, since it is larger than the sum of its proper divisors (2111769).

78134047 is a wasteful number, since it uses less digits than its factorization.

78134047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111768.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 78134047 is about 8839.3465256205. The cubic root of 78134047 is about 427.5104875281.

The spelling of 78134047 in words is "seventy-eight million, one hundred thirty-four thousand, forty-seven".