78057216 has 144 divisors (see below), whose sum is σ = 241355520. Its totient is φ = 24837120.

The previous prime is 78057179. The next prime is 78057223. The reversal of 78057216 is 61275087.

78057216 is a `hidden beast` number, since 7 + 80 + 572 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158731 + ... + 159221.

It is an arithmetic number, because the mean of its divisors is an integer number (1676080).

Almost surely, 2^78057216 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 78057216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120677760).

78057216 is an abundant number, since it is smaller than the sum of its proper divisors (163298304).

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

78057216 is a wasteful number, since it uses less digits than its factorization.

78057216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 78057216 is about 8834.9994906621. Note that the first 3 decimals coincide. The cubic root of 78057216 is about 427.3703146180.

The spelling of 78057216 in words is "seventy-eight million, fifty-seven thousand, two hundred sixteen".