78864156 has 144 divisors (see below), whose sum is σ = 247665600. Its totient is φ = 20643840.

The previous prime is 78864151. The next prime is 78864157. The reversal of 78864156 is 65146887.

78864156 = T₃₂₁ + T₃₂₂ + ... + T₇₉₆.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78864151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 175420 + ... + 175868.

It is an arithmetic number, because the mean of its divisors is an integer number (1719900).

Almost surely, 2^78864156 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 78864156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123832800).

78864156 is an abundant number, since it is smaller than the sum of its proper divisors (168801444).

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

78864156 is a wasteful number, since it uses less digits than its factorization.

78864156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 519 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 78864156 is about 8880.5493073345. The cubic root of 78864156 is about 428.8379585907.

The spelling of 78864156 in words is "seventy-eight million, eight hundred sixty-four thousand, one hundred fifty-six".