78206784 has 56 divisors (see below), whose sum is σ = 209873088. Its totient is φ = 25697280.

The previous prime is 78206759. The next prime is 78206827. The reversal of 78206784 is 48760287.

It is a super-2 number, since 2×78206784² = 12232602127245312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10764 + ... + 16500.

Almost surely, 2^78206784 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 78206784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104936544).

78206784 is an abundant number, since it is smaller than the sum of its proper divisors (131666304).

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

78206784 is a wasteful number, since it uses less digits than its factorization.

78206784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823 (or 5813 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 78206784 is about 8843.4599563745. The cubic root of 78206784 is about 427.6431065643.

The spelling of 78206784 in words is "seventy-eight million, two hundred six thousand, seven hundred eighty-four".