78778157 has 8 divisors (see below), whose sum is σ = 81820800. Its totient is φ = 75792544.

The previous prime is 78778129. The next prime is 78778207. The reversal of 78778157 is 75187787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78778157 - 2¹² = 78774061 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 (78778127) 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 7 ways as a sum of consecutive naturals, for example, 11432 + ... + 16977.

It is an arithmetic number, because the mean of its divisors is an integer number (10227600).

Almost surely, 2^78778157 is an apocalyptic number.

It is an amenable number.

78778157 is a deficient number, since it is larger than the sum of its proper divisors (3042643).

78778157 is a wasteful number, since it uses less digits than its factorization.

78778157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28515.

The product of its digits is 768320, while the sum is 50.

The square root of 78778157 is about 8875.7060000881. The cubic root of 78778157 is about 428.6820235796.

The spelling of 78778157 in words is "seventy-eight million, seven hundred seventy-eight thousand, one hundred fifty-seven".