78784751 has 4 divisors (see below), whose sum is σ = 78852312. Its totient is φ = 78717192.

The previous prime is 78784721. The next prime is 78784753. The reversal of 78784751 is 15748787.

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 78784751 - 2¹⁴ = 78768367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78784696 and 78784705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78784753) 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, 32000 + ... + 34373.

It is an arithmetic number, because the mean of its divisors is an integer number (19713078).

Almost surely, 2^78784751 is an apocalyptic number.

78784751 is a deficient number, since it is larger than the sum of its proper divisors (67561).

78784751 is a wasteful number, since it uses less digits than its factorization.

78784751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67560.

The product of its digits is 439040, while the sum is 47.

The square root of 78784751 is about 8876.0774557233. The cubic root of 78784751 is about 428.6939839610.

The spelling of 78784751 in words is "seventy-eight million, seven hundred eighty-four thousand, seven hundred fifty-one".