78540351 has 4 divisors (see below), whose sum is σ = 104720472. Its totient is φ = 52360232.

The previous prime is 78540347. The next prime is 78540353. The reversal of 78540351 is 15304587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15304587 = 3 ⋅5101529.

It is a cyclic number.

It is not a de Polignac number, because 78540351 - 2² = 78540347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78540353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13090056 + ... + 13090061.

It is an arithmetic number, because the mean of its divisors is an integer number (26180118).

Almost surely, 2^78540351 is an apocalyptic number.

78540351 is a deficient number, since it is larger than the sum of its proper divisors (26180121).

78540351 is a wasteful number, since it uses less digits than its factorization.

78540351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26180120.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 78540351 is about 8862.2994194509. The cubic root of 78540351 is about 428.2502376148.

The spelling of 78540351 in words is "seventy-eight million, five hundred forty thousand, three hundred fifty-one".