78191136 has 48 divisors (see below), whose sum is σ = 228060000. Its totient is φ = 26063424.

The previous prime is 78191131. The next prime is 78191167. The reversal of 78191136 is 63119187.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×78191136² = 12227707497940992, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 78191136.

It is not an unprimeable number, because it can be changed into a prime (78191131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44386 + ... + 46113.

It is an arithmetic number, because the mean of its divisors is an integer number (4751250).

Almost surely, 2^78191136 is an apocalyptic number.

It is an amenable number.

78191136 is an abundant number, since it is smaller than the sum of its proper divisors (149868864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78191136 is a wasteful number, since it uses less digits than its factorization.

78191136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90518 (or 90504 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 78191136 is about 8842.5751905200. The cubic root of 78191136 is about 427.6145830128.

The spelling of 78191136 in words is "seventy-eight million, one hundred ninety-one thousand, one hundred thirty-six".