78338280 has 64 divisors (see below), whose sum is σ = 243129600. Its totient is φ = 20168960.

The previous prime is 78338257. The next prime is 78338291. The reversal of 78338280 is 8283387.

It is a happy number.

It is a super-2 number, since 2×78338280² = 12273772226716800, which contains 22 as substring.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 7776 + ... + 14735.

It is an arithmetic number, because the mean of its divisors is an integer number (3798900).

Almost surely, 2^78338280 is an apocalyptic number.

It is an amenable number.

78338280 is an abundant number, since it is smaller than the sum of its proper divisors (164791320).

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

78338280 is a wasteful number, since it uses less digits than its factorization.

78338280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22554 (or 22550 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 78338280 is about 8850.8914805233. The cubic root of 78338280 is about 427.8826504494.

The spelling of 78338280 in words is "seventy-eight million, three hundred thirty-eight thousand, two hundred eighty".