78133187 has 16 divisors (see below), whose sum is σ = 90107520. Its totient is φ = 67003200.

The previous prime is 78133177. The next prime is 78133217.

78133187 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78133187 - 2⁶ = 78133123 is a prime.

It is a super-2 number, since 2×78133187² = 12209589821553938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78133187.

It is not an unprimeable number, because it can be changed into a prime (78133127) 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 15 ways as a sum of consecutive naturals, for example, 58487 + ... + 59807.

It is an arithmetic number, because the mean of its divisors is an integer number (5631720).

Almost surely, 2^78133187 is an apocalyptic number.

78133187 is a deficient number, since it is larger than the sum of its proper divisors (11974333).

78133187 is a wasteful number, since it uses less digits than its factorization.

78133187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634.

The product of its digits is 28224, while the sum is 38.

The square root of 78133187 is about 8839.2978793567. The cubic root of 78133187 is about 427.5089190255.

The spelling of 78133187 in words is "seventy-eight million, one hundred thirty-three thousand, one hundred eighty-seven".