78722208 has 72 divisors (see below), whose sum is σ = 227586996. Its totient is φ = 25804800.

The previous prime is 78722197. The next prime is 78722221. The reversal of 78722208 is 80222787.

It can be written as a sum of positive squares in 2 ways, for example, as 76947984 + 1774224 = 8772^2 + 1332^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15328 + ... + 19808.

Almost surely, 2^78722208 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 78722208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113793498).

78722208 is an abundant number, since it is smaller than the sum of its proper divisors (148864788).

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

78722208 is a wasteful number, since it uses less digits than its factorization.

78722208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558 (or 4547 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 78722208 is about 8872.5536346646. The cubic root of 78722208 is about 428.5805148550.

The spelling of 78722208 in words is "seventy-eight million, seven hundred twenty-two thousand, two hundred eight".