78193155 has 32 divisors (see below), whose sum is σ = 128616768. Its totient is φ = 40550400.

The previous prime is 78193121. The next prime is 78193163. The reversal of 78193155 is 55139187.

It is not a de Polignac number, because 78193155 - 2⁶ = 78193091 is a prime.

It is a super-2 number, since 2×78193155² = 12228338977708050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88315 + ... + 89195.

It is an arithmetic number, because the mean of its divisors is an integer number (4019274).

Almost surely, 2^78193155 is an apocalyptic number.

78193155 is a deficient number, since it is larger than the sum of its proper divisors (50423613).

78193155 is a wasteful number, since it uses less digits than its factorization.

78193155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047.

The product of its digits is 37800, while the sum is 39.

The square root of 78193155 is about 8842.6893533585. The cubic root of 78193155 is about 427.6182635085.

The spelling of 78193155 in words is "seventy-eight million, one hundred ninety-three thousand, one hundred fifty-five".