78725155 has 16 divisors (see below), whose sum is σ = 96346368. Its totient is φ = 61740000.

The previous prime is 78725149. The next prime is 78725177. The reversal of 78725155 is 55152787.

It is not a de Polignac number, because 78725155 - 2⁵ = 78725123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74380 + ... + 75430.

It is an arithmetic number, because the mean of its divisors is an integer number (6021648).

Almost surely, 2^78725155 is an apocalyptic number.

78725155 is a deficient number, since it is larger than the sum of its proper divisors (17621213).

78725155 is a wasteful number, since it uses less digits than its factorization.

78725155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338.

The product of its digits is 98000, while the sum is 40.

The square root of 78725155 is about 8872.7197070571. The cubic root of 78725155 is about 428.5858628207.

The spelling of 78725155 in words is "seventy-eight million, seven hundred twenty-five thousand, one hundred fifty-five".