78134487 has 4 divisors (see below), whose sum is σ = 104179320. Its totient is φ = 52089656.

The previous prime is 78134447. The next prime is 78134521. The reversal of 78134487 is 78443187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78134487 - 2⁶ = 78134423 is a prime.

It is a super-2 number, since 2×78134487² = 12209996117506338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78134437) 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, 13022412 + ... + 13022417.

It is an arithmetic number, because the mean of its divisors is an integer number (26044830).

Almost surely, 2^78134487 is an apocalyptic number.

78134487 is a deficient number, since it is larger than the sum of its proper divisors (26044833).

78134487 is a wasteful number, since it uses less digits than its factorization.

78134487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26044832.

The product of its digits is 150528, while the sum is 42.

The square root of 78134487 is about 8839.3714143032. The cubic root of 78134487 is about 427.5112900134.

The spelling of 78134487 in words is "seventy-eight million, one hundred thirty-four thousand, four hundred eighty-seven".