78036840 has 192 divisors, whose sum is σ = 293155200. Its totient is φ = 17634816.

The previous prime is 78036839. The next prime is 78036887. The reversal of 78036840 is 4863087.

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

It is a junction number, because it is equal to n+sod(n) for n = 78036795 and 78036804.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 435871 + ... + 436049.

It is an arithmetic number, because the mean of its divisors is an integer number (1526850).

Almost surely, 2^78036840 is an apocalyptic number.

78036840 is a gapful number since it is divisible by the number (70) 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 78036840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146577600).

78036840 is an abundant number, since it is smaller than the sum of its proper divisors (215118360).

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

78036840 is a wasteful number, since it uses less digits than its factorization.

78036840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 78036840 is about 8833.8462744152. The cubic root of 78036840 is about 427.3331245677. Note that the first 3 decimals are identical.

The spelling of 78036840 in words is "seventy-eight million, thirty-six thousand, eight hundred forty".