78380280 has 96 divisors (see below), whose sum is σ = 277907760. Its totient is φ = 19000320.

The previous prime is 78380279. The next prime is 78380287. The reversal of 78380280 is 8208387.

It is a super-2 number, since 2×78380280² = 12286936585756800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78380287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5937 + ... + 13856.

Almost surely, 2^78380280 is an apocalyptic number.

It is an amenable number.

78380280 is an abundant number, since it is smaller than the sum of its proper divisors (199527480).

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

78380280 is a wasteful number, since it uses less digits than its factorization.

78380280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19821 (or 19814 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 78380280 is about 8853.2638049479. The cubic root of 78380280 is about 427.9591046028.

The spelling of 78380280 in words is "seventy-eight million, three hundred eighty thousand, two hundred eighty".