78387036 has 96 divisors (see below), whose sum is σ = 234974208. Its totient is φ = 19768320.

The previous prime is 78387031. The next prime is 78387037. The reversal of 78387036 is 63078387.

It is a happy number.

It is a super-2 number, since 2×78387036² = 12289054825730592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78387031) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 23556 + ... + 26676.

It is an arithmetic number, because the mean of its divisors is an integer number (2447648).

Almost surely, 2^78387036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78387036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117487104).

78387036 is an abundant number, since it is smaller than the sum of its proper divisors (156587172).

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

78387036 is a wasteful number, since it uses less digits than its factorization.

78387036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171 (or 3169 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 78387036 is about 8853.6453509275. The cubic root of 78387036 is about 427.9714002493.

The spelling of 78387036 in words is "seventy-eight million, three hundred eighty-seven thousand, thirty-six".