78380278 has 4 divisors (see below), whose sum is σ = 117570420. Its totient is φ = 39190138.

The previous prime is 78380227. The next prime is 78380279. The reversal of 78380278 is 87208387.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78380278² = 12286935958714568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78380279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19595068 + ... + 19595071.

It is an arithmetic number, because the mean of its divisors is an integer number (29392605).

Almost surely, 2^78380278 is an apocalyptic number.

78380278 is a deficient number, since it is larger than the sum of its proper divisors (39190142).

78380278 is a wasteful number, since it uses less digits than its factorization.

78380278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39190141.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 78380278 is about 8853.2636919952. The cubic root of 78380278 is about 427.9591009628.

The spelling of 78380278 in words is "seventy-eight million, three hundred eighty thousand, two hundred seventy-eight".