78501312 has 140 divisors (see below), whose sum is σ = 245257320. Its totient is φ = 24758784.

The previous prime is 78501307. The next prime is 78501343. The reversal of 78501312 is 21310587.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 98098 + ... + 98894.

It is an arithmetic number, because the mean of its divisors is an integer number (1751838).

Almost surely, 2^78501312 is an apocalyptic number.

78501312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78501312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122628660).

78501312 is an abundant number, since it is smaller than the sum of its proper divisors (166756008).

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

78501312 is a wasteful number, since it uses less digits than its factorization.

78501312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 78501312 is about 8860.0966134687. The cubic root of 78501312 is about 428.1792709861.

Adding to 78501312 its reverse (21310587), we get a palindrome (99811899).

The spelling of 78501312 in words is "seventy-eight million, five hundred one thousand, three hundred twelve".