78705151 has 4 divisors (see below), whose sum is σ = 89948752. Its totient is φ = 67461552.

The previous prime is 78705127. The next prime is 78705161. The reversal of 78705151 is 15150787.

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 78705151 - 2¹¹ = 78703103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78705161) 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, 5621790 + ... + 5621803.

It is an arithmetic number, because the mean of its divisors is an integer number (22487188).

Almost surely, 2^78705151 is an apocalyptic number.

78705151 is a deficient number, since it is larger than the sum of its proper divisors (11243601).

78705151 is a wasteful number, since it uses less digits than its factorization.

78705151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11243600.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 78705151 is about 8871.5923598867. The cubic root of 78705151 is about 428.5495586353.

The spelling of 78705151 in words is "seventy-eight million, seven hundred five thousand, one hundred fifty-one".