78134791 has 16 divisors (see below), whose sum is σ = 90961920. Its totient is φ = 65736000.

The previous prime is 78134759. The next prime is 78134803. The reversal of 78134791 is 19743187.

It is a cyclic number.

It is not a de Polignac number, because 78134791 - 2⁵ = 78134759 is a prime.

It is a super-2 number, since 2×78134791² = 12210091129227362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78134191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103666 + ... + 104416.

It is an arithmetic number, because the mean of its divisors is an integer number (5685120).

Almost surely, 2^78134791 is an apocalyptic number.

78134791 is a deficient number, since it is larger than the sum of its proper divisors (12827129).

78134791 is a wasteful number, since it uses less digits than its factorization.

78134791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014.

The product of its digits is 42336, while the sum is 40.

The square root of 78134791 is about 8839.3886100793. The cubic root of 78134791 is about 427.5118444560.

The spelling of 78134791 in words is "seventy-eight million, one hundred thirty-four thousand, seven hundred ninety-one".