78851380 has 12 divisors (see below), whose sum is σ = 165587940. Its totient is φ = 31540544.

The previous prime is 78851369. The next prime is 78851431. The reversal of 78851380 is 8315887.

It can be written as a sum of positive squares in 2 ways, for example, as 18974736 + 59876644 = 4356^2 + 7738^2 .

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 3 ways as a sum of consecutive naturals, for example, 1971265 + ... + 1971304.

It is an arithmetic number, because the mean of its divisors is an integer number (13798995).

Almost surely, 2^78851380 is an apocalyptic number.

It is an amenable number.

78851380 is an abundant number, since it is smaller than the sum of its proper divisors (86736560).

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

78851380 is a wasteful number, since it uses less digits than its factorization.

78851380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3942578 (or 3942576 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 78851380 is about 8879.8299533268. The cubic root of 78851380 is about 428.8148000781.

The spelling of 78851380 in words is "seventy-eight million, eight hundred fifty-one thousand, three hundred eighty".