78811351 has 4 divisors (see below), whose sum is σ = 79104600. Its totient is φ = 78518104.

The previous prime is 78811333. The next prime is 78811423. The reversal of 78811351 is 15311887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15311887 = 293 ⋅52259.

It is a cyclic number.

It is not a de Polignac number, because 78811351 - 2¹⁷ = 78680279 is a prime.

It is a super-2 number, since 2×78811351² = 12422458092890402, 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 (78811321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146221 + ... + 146758.

It is an arithmetic number, because the mean of its divisors is an integer number (19776150).

Almost surely, 2^78811351 is an apocalyptic number.

78811351 is a deficient number, since it is larger than the sum of its proper divisors (293249).

78811351 is a wasteful number, since it uses less digits than its factorization.

78811351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293248.

The product of its digits is 6720, while the sum is 34.

The square root of 78811351 is about 8877.5757389053. The cubic root of 78811351 is about 428.7422250090.

The spelling of 78811351 in words is "seventy-eight million, eight hundred eleven thousand, three hundred fifty-one".