78191250 has 80 divisors (see below), whose sum is σ = 202435200. Its totient is φ = 20104000.

The previous prime is 78191231. The next prime is 78191257. The reversal of 78191250 is 5219187.

It is a super-2 number, since 2×78191250² = 12227743153125000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78191257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 108391 + ... + 109109.

It is an arithmetic number, because the mean of its divisors is an integer number (2530440).

Almost surely, 2^78191250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78191250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101217600).

78191250 is an abundant number, since it is smaller than the sum of its proper divisors (124243950).

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

78191250 is a wasteful number, since it uses less digits than its factorization.

78191250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 78191250 is about 8842.5816366036. The cubic root of 78191250 is about 427.6147908285.

The spelling of 78191250 in words is "seventy-eight million, one hundred ninety-one thousand, two hundred fifty".