78780320 has 24 divisors (see below), whose sum is σ = 186118884. Its totient is φ = 31512064.

The previous prime is 78780293. The next prime is 78780337. The reversal of 78780320 is 2308787.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 73342096 + 5438224 = 8564^2 + 2332^2 .

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 3 ways as a sum of consecutive naturals, for example, 246029 + ... + 246348.

Almost surely, 2^78780320 is an apocalyptic number.

It is an amenable number.

78780320 is an abundant number, since it is smaller than the sum of its proper divisors (107338564).

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

78780320 is a wasteful number, since it uses less digits than its factorization.

78780320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492392 (or 492384 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 78780320 is about 8875.8278487136. The cubic root of 78780320 is about 428.6859469630.

The spelling of 78780320 in words is "seventy-eight million, seven hundred eighty thousand, three hundred twenty".