78454216 has 8 divisors (see below), whose sum is σ = 147101670. Its totient is φ = 39227104.

The previous prime is 78454199. The next prime is 78454217. The reversal of 78454216 is 61245487.

It can be written as a sum of positive squares in only one way, i.e., 78251716 + 202500 = 8846^2 + 450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (78454217) 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 as a sum of consecutive naturals, namely, 4903381 + ... + 4903396.

Almost surely, 2^78454216 is an apocalyptic number.

78454216 is the 4735-th centered heptagonal number.

It is an amenable number.

78454216 is a deficient number, since it is larger than the sum of its proper divisors (68647454).

78454216 is a wasteful number, since it uses less digits than its factorization.

78454216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9806783 (or 9806779 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 78454216 is about 8857.4384558968. The cubic root of 78454216 is about 428.0936267063.

The spelling of 78454216 in words is "seventy-eight million, four hundred fifty-four thousand, two hundred sixteen".